diff --git a/dcc-network/operation/dccnetwork.cpp b/dcc-network/operation/dccnetwork.cpp
index 644a1cf3..887dbb06 100644
--- a/dcc-network/operation/dccnetwork.cpp
+++ b/dcc-network/operation/dccnetwork.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2024 - 2027 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2024 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 #include "dccnetwork.h"
@@ -33,9 +33,16 @@ DccNetwork::DccNetwork(QObject *parent)
     QMetaObject::invokeMethod(this, "init", Qt::QueuedConnection);
 }
 
+DccNetwork::~DccNetwork()
+{
+    if (m_manager) {
+        disconnect(m_manager, &NetManager::request, this, &DccNetwork::request);
+    }
+}
+
 NetItem *DccNetwork::root() const
 {
-    return m_manager->root();
+    return m_manager ? m_manager->root() : nullptr;
 }
 
 bool DccNetwork::CheckPasswordValid(const QString &key, const QString &password)
diff --git a/dcc-network/operation/dccnetwork.h b/dcc-network/operation/dccnetwork.h
index 73582afd..6e587987 100644
--- a/dcc-network/operation/dccnetwork.h
+++ b/dcc-network/operation/dccnetwork.h
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2024 - 2027 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2024 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 #ifndef DCCNETWORK_H
@@ -23,6 +23,7 @@ class DccNetwork : public QObject
 
 public:
     explicit DccNetwork(QObject *parent = nullptr);
+    ~DccNetwork() override;
     NetItem *root() const;
     Q_INVOKABLE static bool CheckPasswordValid(const QString &key, const QString &password);
 
diff --git a/net-view/operation/private/netmanagerthreadprivate.cpp b/net-view/operation/private/netmanagerthreadprivate.cpp
index 6f80ecb3..efa5ecb9 100644
--- a/net-view/operation/private/netmanagerthreadprivate.cpp
+++ b/net-view/operation/private/netmanagerthreadprivate.cpp
@@ -98,6 +98,7 @@ NetManagerThreadPrivate::NetManagerThreadPrivate()
     , m_netCheckAvailable(false)
     , m_isSleeping(false)
     , m_showPageTimer(nullptr)
+    , m_vpnStateUpdateTimer(nullptr)
     , m_supportWireless(false)
 {
     moveToThread(m_thread);
@@ -106,12 +107,15 @@ NetManagerThreadPrivate::NetManagerThreadPrivate()
 
 NetManagerThreadPrivate::~NetManagerThreadPrivate()
 {
+    // 先断开所有信号，防止析构期间再有新任务（如singleShot）入队
+    disconnect();
     m_thread->quit();
-    m_thread->wait(QDeadlineTimer(200));
+    // 增大等待时间至1000ms，避免50ms定时器回调等正在执行的任务被terminate强杀
+    m_thread->wait(QDeadlineTimer(1000));
     if (m_thread->isRunning()) {
         m_thread->terminate();
     }
-    m_thread->wait(QDeadlineTimer(200));
+    m_thread->wait(QDeadlineTimer(500));
     delete m_thread;
 }
 
@@ -416,6 +420,9 @@ void NetManagerThreadPrivate::doInit()
         }
         Q_EMIT itemAdded("Root", vpnControlItem);
 
+        m_vpnStateUpdateTimer = new QTimer(this);
+        m_vpnStateUpdateTimer->setSingleShot(true);
+        m_vpnStateUpdateTimer->setInterval(55);
         auto updateVPNConnectionState = [this]() {
             auto itemList = NetworkController::instance()->vpnController()->items();
             NetType::NetDeviceStatus state = NetType::DS_Disconnected;
@@ -431,8 +438,10 @@ void NetManagerThreadPrivate::doInit()
             }
             Q_EMIT dataChanged(DataChanged::VPNConnectionStateChanged, "NetVPNControlItem", QVariant::fromValue(state));
         };
-        auto vpnConnectionStateChanged = [this, updateVPNConnectionState] {
-            QTimer::singleShot(50, this, updateVPNConnectionState);
+        connect(m_vpnStateUpdateTimer, &QTimer::timeout, this, updateVPNConnectionState);
+        auto vpnConnectionStateChanged = [this] {
+            // 使用成员定时器，重复触发时自动重置计时，防止多次触发累积
+            m_vpnStateUpdateTimer->start();
         };
 
         auto vpnItemChanged = [this, vpnConnectionStateChanged] {
@@ -596,6 +605,11 @@ void NetManagerThreadPrivate::clearData()
         delete m_autoScanTimer;
         m_autoScanTimer = nullptr;
     }
+    if (m_vpnStateUpdateTimer) {
+        m_vpnStateUpdateTimer->stop();
+        delete m_vpnStateUpdateTimer;
+        m_vpnStateUpdateTimer = nullptr;
+    }
     if (m_secretAgent) {
         delete m_secretAgent;
         m_secretAgent = nullptr;
diff --git a/net-view/operation/private/netmanagerthreadprivate.h b/net-view/operation/private/netmanagerthreadprivate.h
index 803b8f62..326554a3 100644
--- a/net-view/operation/private/netmanagerthreadprivate.h
+++ b/net-view/operation/private/netmanagerthreadprivate.h
@@ -299,6 +299,7 @@ protected Q_SLOTS:
     QMap<NetworkDetails *, QString> m_detailsItemsMap; // 存储 NetworkDetails 指针到唯一ID的映射
     QString m_showPageCmd;
     QTimer *m_showPageTimer;
+    QTimer *m_vpnStateUpdateTimer;
     QString m_newVPNuuid;
     bool m_supportWireless;
 };
diff --git a/src/networkcontroller.cpp b/src/networkcontroller.cpp
index f8c3a899..502e9166 100644
--- a/src/networkcontroller.cpp
+++ b/src/networkcontroller.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2018 - 2022 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2018 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -18,6 +18,8 @@
 #include "wirelessdevice.h"
 #include "connectivityhandler.h"
 
+#include <QGlobalStatic>
+
 // const static QString networkService = "org.deepin.dde.Network1";
 // const static QString networkPath = "/org/deepin/dde/Network1";
 static QString localeName;
@@ -102,10 +104,12 @@ void NetworkController::onDeviceAdded(QList<NetworkDeviceBase *> device)
 
 NetworkController::~NetworkController() = default;
 
+// 文件级互斥锁，instance() 和 free() 共用，防止数据竞争
+Q_GLOBAL_STATIC(QMutex, s_networkControllerMutex)
+
 NetworkController *NetworkController::instance()
 {
-    static QMutex m;
-    QMutexLocker locker(&m);
+    QMutexLocker locker(s_networkControllerMutex());
     if (!m_networkController) {
         m_networkController = new NetworkController;
     };
@@ -114,6 +118,7 @@ NetworkController *NetworkController::instance()
 
 void NetworkController::free()
 {
+    QMutexLocker locker(s_networkControllerMutex());
     if (m_networkController) {
         m_networkController->deleteLater();
         m_networkController = nullptr;