diff --git a/Tun/Punchnet/Actors/SDLContextActor.swift b/Tun/Punchnet/Actors/SDLContextActor.swift
index 6757622..9448d71 100644
--- a/Tun/Punchnet/Actors/SDLContextActor.swift
+++ b/Tun/Punchnet/Actors/SDLContextActor.swift
@@ -57,6 +57,7 @@ actor SDLContextActor {
     // 依赖的变量
     private var udpHole: SDLUDPHole?
     private var udpHoleMonitorTask: Task<Void, Never>?
+    private var natProbeTask: Task<Void, Never>?
     private var udpHoleLocalAddress: SocketAddress?
     
     private var udpHoleV6: SDLUDPHoleV6?
@@ -381,9 +382,15 @@ actor SDLContextActor {
         }
         
         // 开始探测nat的类型
-        Task {
+        self.natProbeTask?.cancel()
+        let proberActor = self.proberActor
+        self.natProbeTask = Task { [weak self] in
             SDLLogger.log("[SDLContext] start probeNatType")
-            await self.probeNatType()
+            let natType = await proberActor.probeNatType(using: udpHole)
+            if Task.isCancelled {
+                return
+            }
+            await self?.setNatType(natType: natType)
         }
         
         SDLLogger.log("[SDLContext] udpHole ready")
@@ -499,11 +506,21 @@ actor SDLContextActor {
 
         self.udpHoleMonitorTask?.cancel()
         self.udpHoleMonitorTask = nil
+        self.natProbeTask?.cancel()
+        self.natProbeTask = nil
         udpHoleV6?.stop()
         await udpHole?.stop()
 
+        let dnsClient = self.dnsClient
+        self.dnsClient = nil
+        let dnsLocalClient = self.dnsLocalClient
+        self.dnsLocalClient = nil
         self.dnsMonitorTask?.cancel()
+        self.dnsMonitorTask = nil
         self.dnsLocalMonitorTask?.cancel()
+        self.dnsLocalMonitorTask = nil
+        dnsClient?.stop()
+        await dnsLocalClient?.stop()
         
         let quicClient = self.quicClient
         self.quicClient = nil
@@ -564,10 +581,11 @@ actor SDLContextActor {
         await self.ipv6AssistClient?.stop()
         self.ipv6AssistClient = SDLIPV6AssistClient(assistServerInfo: welcome.ipv6Assist)
         await self.ipv6AssistClient?.start()
+        let ipv6AssistClient = self.ipv6AssistClient
         
         // 通过 welcome信息拿到当前可用使用的ipv6地址
         // 处理心跳逻辑
-        self.stunRequestTask = Task.detached {
+        self.stunRequestTask = Task.detached { [weak self] in
             let timerStream = SDLAsyncTimerStream()
             timerStream.start(interval: .seconds(8))
             
@@ -576,13 +594,13 @@ actor SDLContextActor {
                     break
                 }
 
-                let probeReply = try? await self.ipv6AssistClient?.probe(requestTimeout: .seconds(3))
+                let probeReply = try? await ipv6AssistClient?.probe(requestTimeout: .seconds(3))
                 if let v6Info = probeReply?.v6Info, let v6Address = SDLUtil.ipv6DataToString(v6Info.v6) {
                     SDLLogger.log("[SDLContext] probe ipv6 address: \(v6Address)")
                 } else {
                     SDLLogger.log("[SDLContext] probe ipv6 address: empty")
                 }
-                await self.sendStunRequest(probeReply: probeReply)
+                await self?.sendStunRequest(probeReply: probeReply)
             }
             
             SDLLogger.log("[SDLContext] udp stunRequestTask cancel")
@@ -617,16 +635,21 @@ actor SDLContextActor {
         self.readTask?.cancel()
         
         // 开启新的任务
-        self.readTask = Task.detached(priority: .high) {
+        let provider = self.provider
+        self.readTask = Task.detached(priority: .high) { [weak self] in
             repeat {
                 if Task.isCancelled {
                     return
                 }
                 
-                let (packets, numbers) = await self.provider.packetFlow.readPackets()
+                let (packets, numbers) = await provider.packetFlow.readPackets()
+                if Task.isCancelled {
+                    return
+                }
+                
                 for (data, number) in zip(packets, numbers) where number == 2 {
                     if let ipPacket = IPPacket(data) {
-                        await self.dealTunPacket(packet: ipPacket)
+                        await self?.dealTunPacket(packet: ipPacket)
                     }
                 }
             } while true
@@ -741,6 +764,7 @@ actor SDLContextActor {
         self.udpHoleLocalAddress = nil
         self.udpHoleV6 = nil
         self.dnsClient = nil
+        SDLLogger.log("[SDLContext] deinit", for: .debug)
     }
 }
 
diff --git a/Tun/Punchnet/SDLAsyncTimerStream.swift b/Tun/Punchnet/SDLAsyncTimerStream.swift
index 5e43a1e..03f9fbe 100644
--- a/Tun/Punchnet/SDLAsyncTimerStream.swift
+++ b/Tun/Punchnet/SDLAsyncTimerStream.swift
@@ -19,13 +19,14 @@ class SDLAsyncTimerStream {
     
     func start(interval: DispatchTimeInterval) {
         timer.schedule(deadline: .now(), repeating: interval)
-        timer.setEventHandler {
-            self.cont.yield()
+        timer.setEventHandler { [weak self] in
+            self?.cont.yield()
         }
         timer.resume()
     }
     
     deinit {
+        self.cont.finish()
         self.timer.cancel()
     }