diff --git a/src/api/live.js b/src/api/live.js
index fbb8490..e72ed3a 100644
--- a/src/api/live.js
+++ b/src/api/live.js
@@ -22,6 +22,22 @@ export function leaveLive(dockId, sessionId) {
   return request.delete(`/v1/live/${dockId}/sessions/${sessionId}/viewers/me`)
 }
 
+/** pagehide/unload: best-effort leave that outlives the page */
+export function leaveLiveKeepalive(dockId, sessionId) {
+  if (!dockId || !sessionId || typeof fetch !== 'function') return
+  const token = localStorage.getItem('token') || ''
+  const headers = { 'Content-Type': 'application/json' }
+  if (token) headers.Authorization = `Bearer ${token}`
+  try {
+    fetch(`/api/v1/live/${encodeURIComponent(dockId)}/sessions/${encodeURIComponent(sessionId)}/viewers/me`, {
+      method: 'DELETE',
+      headers,
+      keepalive: true,
+      credentials: 'same-origin',
+    }).catch(() => {})
+  } catch (_) {}
+}
+
 export function stopLive(dockId) {
   return request.post(`/v1/live/${dockId}/stop`)
 }
diff --git a/src/composables/useMonitorLive.js b/src/composables/useMonitorLive.js
index de18bca..55f19eb 100644
--- a/src/composables/useMonitorLive.js
+++ b/src/composables/useMonitorLive.js
@@ -5,6 +5,7 @@ import {
   heartbeatLive,
   joinLive,
   leaveLive,
+  leaveLiveKeepalive,
   stopLive,
 } from '@/api/live'
 
@@ -13,6 +14,7 @@ const PHASE_TIMEOUT_MS = 60_000
 const PLAY_RETRY_MAX = 3
 const PLAY_EXPIRE_FALLBACK_SEC = 270
 const PLAY_REFRESH_LEAD_MS = 30_000
+const LEASE_INVALID_CODE = 57006
 
 function isFatalPlayMediaError(err) {
   const msg = String(err?.message || err || '').toLowerCase()
@@ -29,6 +31,15 @@ function isFatalPlayMediaError(err) {
   )
 }
 
+function isLeaseInvalidError(err) {
+  return Number(err?.code) === LEASE_INVALID_CODE
+}
+
+function safeLeave(dockId, sessionId) {
+  if (!dockId || !sessionId) return Promise.resolve()
+  return leaveLive(dockId, sessionId).catch(() => {})
+}
+
 export function useMonitorLive({ getDockId, ui, getLivePlayer }) {
   const live = reactive({
     session: null,
@@ -44,6 +55,9 @@ export function useMonitorLive({ getDockId, ui, getLivePlayer }) {
   })
 
   let playURLRequest = null
+  let disposed = false
+  let openGen = 0
+  let rejoinBusy = false
 
   const livePhaseText = computed(() => {
     if (live.opening && !live.session) return '打开中'
@@ -80,6 +94,10 @@ export function useMonitorLive({ getDockId, ui, getLivePlayer }) {
     live.phasePollStartedAt = 0
   }
 
+  function isCurrentOpen(gen) {
+    return !disposed && gen === openGen
+  }
+
   function markPlayFatal(message) {
     window.clearTimeout(live.playRefreshTimer)
     live.playRefreshTimer = null
@@ -90,7 +108,7 @@ export function useMonitorLive({ getDockId, ui, getLivePlayer }) {
   }
 
   function toggleLive() {
-    if (live.opening) return
+    if (disposed || live.opening) return
     if (live.session) closeLive()
     else openLive()
   }
@@ -105,53 +123,72 @@ export function useMonitorLive({ getDockId, ui, getLivePlayer }) {
   }
 
   async function openLive() {
-    if (live.opening || live.session) return
+    if (disposed || live.opening || live.session) return
     const dockId = getDockId?.()
     if (!dockId) return
 
+    const gen = ++openGen
     live.opening = true
     try {
       const result = await joinLive(dockId)
-      live.session = result.session
+      const session = result?.session
+      const sessionId = session?.id
+
+      // 页面已切走/关闭：不要写入状态，立刻释放刚拿到的 viewer lease
+      if (!isCurrentOpen(gen)) {
+        if (sessionId) await safeLeave(dockId, sessionId)
+        return
+      }
+
+      if (!sessionId) {
+        ui.toast('直播会话无效')
+        return
+      }
+
+      live.session = session
       live.dockId = dockId
       live.playUrl = ''
       live.playUrlExpiresAt = 0
       live.playRetryCount = 0
       scheduleLiveHeartbeat(result.leaseExpiresAt)
-      if (result.session.phase === 'streaming') {
+      if (session.phase === 'streaming') {
         try {
           await refreshPlayURL()
         } catch (e) {
+          if (!isCurrentOpen(gen)) return
           await onPlayError(e)
         }
       } else {
         startPhasePolling()
       }
     } catch (e) {
+      if (!isCurrentOpen(gen)) return
       ui.toast(e.message || '打开直播失败')
     } finally {
-      live.opening = false
+      if (gen === openGen) live.opening = false
     }
   }
 
   function startPhasePolling() {
+    if (disposed) return
     window.clearTimeout(live.phasePollTimer)
     live.phasePollStartedAt = Date.now()
     live.phasePollTimer = window.setTimeout(pollPhaseOnce, PHASE_POLL_MS)
   }
 
   async function pollPhaseOnce() {
-    if (!live.dockId || !live.session?.id) return
+    if (disposed || !live.dockId || !live.session?.id) return
     if (Date.now() - live.phasePollStartedAt > PHASE_TIMEOUT_MS) {
       ui.toast('直播启动超时')
       await closeLive(false)
       return
     }
+    const dockId = live.dockId
     const sessionId = live.session.id
     try {
       // http 解包后是 LiveSession 本体，不是 { session }
-      const session = await getLiveSession(live.dockId, sessionId)
-      if (!live.session || live.session.id !== sessionId) return
+      const session = await getLiveSession(dockId, sessionId)
+      if (disposed || !live.session || live.session.id !== sessionId) return
       live.session = session
       if (session.phase === 'streaming') {
         window.clearTimeout(live.phasePollTimer)
@@ -159,6 +196,7 @@ export function useMonitorLive({ getDockId, ui, getLivePlayer }) {
         try {
           await refreshPlayURL()
         } catch (e) {
+          if (disposed || !live.session || live.session.id !== sessionId) return
           await onPlayError(e)
         }
         return
@@ -169,20 +207,27 @@ export function useMonitorLive({ getDockId, ui, getLivePlayer }) {
         return
       }
     } catch (e) {
+      if (disposed || !live.session || live.session.id !== sessionId) return
+      if (isLeaseInvalidError(e)) {
+        await rejoinAfterLeaseInvalid()
+        return
+      }
       ui.toast(e.message || '查询直播状态失败')
       await closeLive(false)
       return
     }
+    if (disposed || !live.session || live.session.id !== sessionId) return
     live.phasePollTimer = window.setTimeout(pollPhaseOnce, PHASE_POLL_MS)
   }
 
   // 成功返回 true；失败抛错，由调用方决定是否 onPlayError（避免互相递归）
   // fromRetry: 播放错误触发的刷新不重置重试计数，避免无限重建
   async function refreshPlayURLOnce({ fromRetry = false } = {}) {
-    if (!live.dockId || !live.session?.id) return false
+    if (disposed || !live.dockId || !live.session?.id) return false
+    const dockId = live.dockId
     const sessionId = live.session.id
-    const play = await getLivePlayURL(live.dockId, sessionId)
-    if (!live.session || live.session.id !== sessionId) return false
+    const play = await getLivePlayURL(dockId, sessionId)
+    if (disposed || !live.session || live.session.id !== sessionId) return false
     live.playUrl = play.playUrl || ''
     const nowSec = Math.floor(Date.now() / 1000)
     live.playUrlExpiresAt = Number(play.expiresAt) || nowSec + PLAY_EXPIRE_FALLBACK_SEC
@@ -200,6 +245,7 @@ export function useMonitorLive({ getDockId, ui, getLivePlayer }) {
   }
 
   function schedulePlayRefresh() {
+    if (disposed) return
     window.clearTimeout(live.playRefreshTimer)
     if (!live.playUrl || live.playUrl.startsWith('fake://') || !live.playUrlExpiresAt) return
     const delay = Math.max(5000, live.playUrlExpiresAt * 1000 - Date.now() - PLAY_REFRESH_LEAD_MS)
@@ -207,44 +253,78 @@ export function useMonitorLive({ getDockId, ui, getLivePlayer }) {
       try {
         await refreshPlayURL()
       } catch (e) {
+        if (disposed) return
+        if (isLeaseInvalidError(e)) {
+          await rejoinAfterLeaseInvalid()
+          return
+        }
         await onPlayError(e)
       }
     }, delay)
   }
 
   function scheduleLiveHeartbeat(expiresAt) {
+    if (disposed) return
     window.clearTimeout(live.heartbeatTimer)
     const delay = Math.max(5000, (Number(expiresAt) * 1000 - Date.now()) / 2)
     live.heartbeatTimer = window.setTimeout(async () => {
-      if (!live.dockId || !live.session?.id) return
+      if (disposed || !live.dockId || !live.session?.id) return
       const dockId = live.dockId
       const sessionId = live.session.id
       try {
         const result = await heartbeatLive(dockId, sessionId)
-        if (!live.session || live.session.id !== sessionId || live.dockId !== dockId) return
+        if (disposed || !live.session || live.session.id !== sessionId || live.dockId !== dockId) return
         live.session = result.session
         scheduleLiveHeartbeat(result.leaseExpiresAt)
         if (result.session.phase === 'streaming' && !live.playUrl) {
           try {
             await refreshPlayURL()
           } catch (e) {
+            if (disposed || !live.session || live.session.id !== sessionId) return
+            if (isLeaseInvalidError(e)) {
+              await rejoinAfterLeaseInvalid()
+              return
+            }
             await onPlayError(e)
           }
         }
       } catch (e) {
-        if (!live.session || live.session.id !== sessionId || live.dockId !== dockId) return
+        if (disposed || !live.session || live.session.id !== sessionId || live.dockId !== dockId) return
+        if (isLeaseInvalidError(e)) {
+          await rejoinAfterLeaseInvalid()
+          return
+        }
         ui.toast(e.message || '直播观看已结束')
         await closeLive(false)
       }
     }, delay)
   }
 
+  async function rejoinAfterLeaseInvalid() {
+    if (disposed || rejoinBusy) return
+    rejoinBusy = true
+    try {
+      // 租约失效：停掉旧 session 的 play-url/heartbeat，再重新 join
+      await closeLive(false)
+      if (disposed) return
+      ui.toast('观看租约已失效，正在重新加入直播')
+      await openLive()
+    } finally {
+      rejoinBusy = false
+    }
+  }
+
   async function onPlayError(err) {
-    if (!live.session) return
+    if (disposed || !live.session) return
 
     // AbortError/NotAllowedError: browser pause / autoplay policy. Keep current playUrl.
     if (err?.name === 'AbortError' || err?.name === 'NotAllowedError') return
 
+    if (isLeaseInvalidError(err)) {
+      await rejoinAfterLeaseInvalid()
+      return
+    }
+
     // 播放器媒体面失败（TLS/CORS/HLS network）：换 auth_key 没用，禁止刷 play-url
     if (isFatalPlayMediaError(err) || err?.name === 'HlsError') {
       markPlayFatal(
@@ -264,6 +344,11 @@ export function useMonitorLive({ getDockId, ui, getLivePlayer }) {
     try {
       await refreshPlayURL({ fromRetry: true })
     } catch (e) {
+      if (disposed) return
+      if (isLeaseInvalidError(e)) {
+        await rejoinAfterLeaseInvalid()
+        return
+      }
       if (isFatalPlayMediaError(e) || e?.name === 'HlsError' || live.playRetryCount >= PLAY_RETRY_MAX) {
         markPlayFatal(
           isFatalPlayMediaError(e)
@@ -277,18 +362,32 @@ export function useMonitorLive({ getDockId, ui, getLivePlayer }) {
   }
 
   async function closeLive(sendRequest = true) {
+    // 使 in-flight openLive/join 失效；迟到的 join 结果会走 orphan leave
+    openGen += 1
     const session = live.session
     const dockId = live.dockId
     resetLocal()
     if (sendRequest && session && dockId) {
-      try {
-        await leaveLive(dockId, session.id)
-      } catch (_) {}
+      await safeLeave(dockId, session.id)
+    }
+  }
+
+  /** 页面卸载/刷新：立即失效 generation，并用 keepalive 释放租约 */
+  function dispose({ keepalive = false } = {}) {
+    if (disposed) return
+    disposed = true
+    openGen += 1
+    const session = live.session
+    const dockId = live.dockId
+    resetLocal()
+    if (session && dockId) {
+      if (keepalive) leaveLiveKeepalive(dockId, session.id)
+      else safeLeave(dockId, session.id)
     }
   }
 
   async function stopLiveStream() {
-    if (!live.session || !live.dockId || live.opening) return
+    if (disposed || !live.session || !live.dockId || live.opening) return
     const dockId = live.dockId
     const session = live.session
     const ok = await ui.confirm(
@@ -298,13 +397,12 @@ export function useMonitorLive({ getDockId, ui, getLivePlayer }) {
     )
     if (!ok) return
     // confirm 期间可能已关闭/切换会话，避免 stop 错 dock 或 wipe 新会话
-    if (!live.session || live.dockId !== dockId || live.session.id !== session.id) return
+    if (disposed || !live.session || live.dockId !== dockId || live.session.id !== session.id) return
     try {
       await stopLive(dockId)
+      openGen += 1
       resetLocal()
-      try {
-        await leaveLive(dockId, session.id)
-      } catch (_) {}
+      await safeLeave(dockId, session.id)
       ui.toast('直播已停止')
     } catch (e) {
       ui.toast(e.message || '停止直播失败')
@@ -319,6 +417,7 @@ export function useMonitorLive({ getDockId, ui, getLivePlayer }) {
     fullscreenLive,
     openLive,
     closeLive,
+    dispose,
     stopLiveStream,
     onPlayError,
   }
diff --git a/src/utils/http.js b/src/utils/http.js
index 31dacb5..7b2f3c9 100644
--- a/src/utils/http.js
+++ b/src/utils/http.js
@@ -28,7 +28,10 @@ request.interceptors.response.use(
     if (!response.config.skipErrorToast) {
       useUiStore().toast(res?.msg || '请求失败')
     }
-    return Promise.reject(new Error(res?.msg || '请求失败'))
+    const err = new Error(res?.msg || '请求失败')
+    err.code = res?.code
+    err.response = response
+    return Promise.reject(err)
   },
   (error) => {
     const status = error.response?.status
@@ -47,6 +50,7 @@ request.interceptors.response.use(
       }
       const err = new Error(message)
       err.status = status
+      err.code = data?.code
       err.response = error.response
       return Promise.reject(err)
     }
diff --git a/src/views/MediaView/MediaView.vue b/src/views/MediaView/MediaView.vue
index 58e970a..05d005a 100644
--- a/src/views/MediaView/MediaView.vue
+++ b/src/views/MediaView/MediaView.vue
@@ -76,7 +76,7 @@ import { useRoute, useRouter } from 'vue-router'
 import { useUiStore } from '@/stores/modules/uiStore'
 import request from '@/utils/http'
 import * as urls from '@/config/urls'
-import { getLivePlayURL, heartbeatLive, joinLive, leaveLive } from '@/api/live'
+import { getLivePlayURL, heartbeatLive, joinLive, leaveLive, leaveLiveKeepalive } from '@/api/live'
 import MediaCard from '@/components/MediaCard.vue'
 
 const route = useRoute()
@@ -107,7 +107,19 @@ const activeLive = reactive({
 })
 let heartbeatTimer = null
 let openSeq = 0
+let disposed = false
+let rejoinBusy = false
 
+const LEASE_INVALID_CODE = 57006
+
+function isLeaseInvalidError(err) {
+  return Number(err?.code) === LEASE_INVALID_CODE
+}
+
+function safeLeave(dockId, sessionId) {
+  if (!dockId || !sessionId) return Promise.resolve()
+  return leaveLive(dockId, sessionId).catch(() => {})
+}
 const liveTabLabel = computed(() => `直播中心 ${liveStreams.value.length}`)
 const videosTabLabel = computed(() => `原始视频 ${videos.value.length}`)
 
@@ -142,19 +154,24 @@ function resetActiveLive() {
 
 function scheduleHeartbeat(expiresAt) {
   clearHeartbeat()
-  if (!activeLive.dockId || !activeLive.sessionId) return
+  if (disposed || !activeLive.dockId || !activeLive.sessionId) return
   const delay = Math.max(5000, (Number(expiresAt) * 1000 - Date.now()) / 2)
   heartbeatTimer = window.setTimeout(async () => {
-    if (!activeLive.dockId || !activeLive.sessionId) return
+    if (disposed || !activeLive.dockId || !activeLive.sessionId) return
     const dockId = activeLive.dockId
     const sessionId = activeLive.sessionId
+    const streamId = activeLive.id
     try {
       const result = await heartbeatLive(dockId, sessionId)
-      if (activeLive.sessionId !== sessionId || activeLive.dockId !== dockId) return
+      if (disposed || activeLive.sessionId !== sessionId || activeLive.dockId !== dockId) return
       if (result?.session?.phase) activeLive.phase = result.session.phase
       scheduleHeartbeat(result.leaseExpiresAt)
     } catch (e) {
-      if (activeLive.sessionId !== sessionId || activeLive.dockId !== dockId) return
+      if (disposed || activeLive.sessionId !== sessionId || activeLive.dockId !== dockId) return
+      if (isLeaseInvalidError(e)) {
+        await rejoinAfterLeaseInvalid(streamId, dockId)
+        return
+      }
       ui.toast(e.message || '直播观看已结束')
       resetActiveLive()
     }
@@ -162,13 +179,26 @@ function scheduleHeartbeat(expiresAt) {
 }
 
 async function closeActiveLive({ sendLeave = true } = {}) {
+  openSeq += 1
   const dockId = activeLive.dockId
   const sessionId = activeLive.sessionId
   resetActiveLive()
   if (sendLeave && dockId && sessionId) {
-    try {
-      await leaveLive(dockId, sessionId)
-    } catch (_) {}
+    await safeLeave(dockId, sessionId)
+  }
+}
+
+async function rejoinAfterLeaseInvalid(streamId, dockId) {
+  if (disposed || rejoinBusy) return
+  rejoinBusy = true
+  try {
+    await closeActiveLive({ sendLeave: false })
+    if (disposed) return
+    ui.toast('观看租约已失效，正在重新加入直播')
+    const stream = liveStreams.value.find((s) => s.id === streamId) || { id: streamId, dockId }
+    await openLive(stream)
+  } finally {
+    rejoinBusy = false
   }
 }
 
@@ -206,27 +236,35 @@ async function load() {
 }
 
 async function openLive(stream) {
-  if (!stream?.dockId) return
+  if (disposed || !stream?.dockId) return
   if (activeLive.id === stream.id && activeLive.playUrl) {
     await closeActiveLive()
     return
   }
 
-  const seq = ++openSeq
+  // closeActiveLive 会 bump openSeq，使旧 in-flight join 失效；之后再取本次 seq
   await closeActiveLive()
+  const seq = ++openSeq
 
   try {
     const result = await joinLive(stream.dockId)
-    if (seq !== openSeq) return
     const session = result?.session
-    if (!session?.id) {
+    const sessionId = session?.id
+
+    // 页面已切走/关闭：不要写入状态，立刻释放刚拿到的 viewer lease
+    if (seq !== openSeq || disposed) {
+      if (sessionId) await safeLeave(stream.dockId, sessionId)
+      return
+    }
+
+    if (!sessionId) {
       ui.toast('直播会话无效')
       return
     }
 
     activeLive.id = stream.id
     activeLive.dockId = stream.dockId
-    activeLive.sessionId = session.id
+    activeLive.sessionId = sessionId
     activeLive.phase = session.phase || ''
     activeLive.playUrl = ''
     scheduleHeartbeat(result.leaseExpiresAt)
@@ -236,15 +274,19 @@ async function openLive(stream) {
       return
     }
 
-    const play = await getLivePlayURL(stream.dockId, session.id)
-    if (seq !== openSeq || activeLive.sessionId !== session.id) return
+    const play = await getLivePlayURL(stream.dockId, sessionId)
+    if (seq !== openSeq || disposed || activeLive.sessionId !== sessionId) return
     if (play?.playUrl && !play.playUrl.startsWith('fake://')) {
       activeLive.playUrl = play.playUrl
     } else {
       ui.toast('控制面已验证，当前未配置可播放媒体流')
     }
   } catch (e) {
-    if (seq !== openSeq) return
+    if (seq !== openSeq || disposed) return
+    if (isLeaseInvalidError(e)) {
+      await rejoinAfterLeaseInvalid(stream.id, stream.dockId)
+      return
+    }
     await closeActiveLive()
     ui.toast(e.message || '打开直播失败')
   }
@@ -285,8 +327,23 @@ watch(view, async (next, prev) => {
   await load()
 })
 
-onMounted(load)
+function onPageHide() {
+  disposed = true
+  openSeq += 1
+  const dockId = activeLive.dockId
+  const sessionId = activeLive.sessionId
+  resetActiveLive()
+  if (dockId && sessionId) leaveLiveKeepalive(dockId, sessionId)
+}
+
+onMounted(() => {
+  window.addEventListener('pagehide', onPageHide)
+  load()
+})
+
 onBeforeUnmount(() => {
+  window.removeEventListener('pagehide', onPageHide)
+  disposed = true
   openSeq += 1
   closeActiveLive()
 })
diff --git a/src/views/MonitorView/MonitorView.vue b/src/views/MonitorView/MonitorView.vue
index 08ebbfe..015b39b 100644
--- a/src/views/MonitorView/MonitorView.vue
+++ b/src/views/MonitorView/MonitorView.vue
@@ -127,6 +127,7 @@ const {
   toggleLive,
   fullscreenLive,
   closeLive,
+  dispose: disposeLive,
   stopLiveStream,
   onPlayError,
 } = useMonitorLive({
@@ -135,6 +136,10 @@ const {
   getLivePlayer: () => detailPanelRef.value?.livePlayerRef,
 })
 
+function onPageHide() {
+  disposeLive({ keepalive: true })
+}
+
 const filter = ref('all')
 const search = ref('')
 const controlExpanded = ref(false)
@@ -655,6 +660,7 @@ function teardownMap() {
 }
 
 onMounted(async () => {
+  window.addEventListener('pagehide', onPageHide)
   window.addEventListener('keydown', onGlobalKeydown)
   try {
     await devices.load()
@@ -672,9 +678,10 @@ onMounted(async () => {
 })
 
 onUnmounted(() => {
+  window.removeEventListener('pagehide', onPageHide)
   window.removeEventListener('keydown', onGlobalKeydown)
   closeCommandProgress()
-  closeLive()
+  disposeLive()
   teardownMap()
 })