diff --git a/main/application.cc b/main/application.cc
index bd7de61c..5b76d64c 100644
--- a/main/application.cc
+++ b/main/application.cc
@@ -284,6 +284,9 @@ void Application::Start() {
 #else
     protocol_ = new MqttProtocol();
 #endif
+    protocol_->OnNetworkError([this](const std::string& message) {
+        Alert("Error", std::move(message));
+    });
     protocol_->OnIncomingAudio([this](const std::string& data) {
         std::lock_guard<std::mutex> lock(mutex_);
         audio_decode_queue_.emplace_back(std::move(data));
diff --git a/main/boards/kevin-box-2/axp2101.cc b/main/boards/kevin-box-2/axp2101.cc
index a07da194..daaeaf1d 100644
--- a/main/boards/kevin-box-2/axp2101.cc
+++ b/main/boards/kevin-box-2/axp2101.cc
@@ -4,7 +4,7 @@
 
 #include <esp_log.h>
 
-static const char *TAG = "Axp2101";
+#define TAG "Axp2101"
 
 Axp2101::Axp2101(i2c_master_bus_handle_t i2c_bus, uint8_t addr) : I2cDevice(i2c_bus, addr) {
     // ** EFUSE defaults **
diff --git a/main/protocols/mqtt_protocol.cc b/main/protocols/mqtt_protocol.cc
index c17880a7..cbf4b580 100644
--- a/main/protocols/mqtt_protocol.cc
+++ b/main/protocols/mqtt_protocol.cc
@@ -85,6 +85,9 @@ bool MqttProtocol::StartMqttClient() {
     ESP_LOGI(TAG, "Connecting to endpoint %s", endpoint_.c_str());
     if (!mqtt_->Connect(endpoint_, 8883, client_id_, username_, password_)) {
         ESP_LOGE(TAG, "Failed to connect to endpoint");
+        if (on_network_error_ != nullptr) {
+            on_network_error_("无法连接服务");
+        }
         return false;
     }
 
@@ -167,7 +170,6 @@ bool MqttProtocol::OpenAudioChannel() {
     if (mqtt_ == nullptr || !mqtt_->IsConnected()) {
         ESP_LOGI(TAG, "MQTT is not connected, try to connect now");
         if (!StartMqttClient()) {
-            ESP_LOGE(TAG, "Failed to connect to MQTT");
             return false;
         }
     }
@@ -188,6 +190,9 @@ bool MqttProtocol::OpenAudioChannel() {
     EventBits_t bits = xEventGroupWaitBits(event_group_handle_, MQTT_PROTOCOL_SERVER_HELLO_EVENT, pdTRUE, pdFALSE, pdMS_TO_TICKS(10000));
     if (!(bits & MQTT_PROTOCOL_SERVER_HELLO_EVENT)) {
         ESP_LOGE(TAG, "Failed to receive server hello");
+        if (on_network_error_ != nullptr) {
+            on_network_error_("等待响应超时");
+        }
         return false;
     }
 
diff --git a/main/protocols/protocol.cc b/main/protocols/protocol.cc
index aeff91fd..d9906c2a 100644
--- a/main/protocols/protocol.cc
+++ b/main/protocols/protocol.cc
@@ -19,3 +19,7 @@ void Protocol::OnAudioChannelOpened(std::function<void()> callback) {
 void Protocol::OnAudioChannelClosed(std::function<void()> callback) {
     on_audio_channel_closed_ = callback;
 }
+
+void Protocol::OnNetworkError(std::function<void(const std::string& message)> callback) {
+    on_network_error_ = callback;
+}
diff --git a/main/protocols/protocol.h b/main/protocols/protocol.h
index 063405f3..6261b9ca 100644
--- a/main/protocols/protocol.h
+++ b/main/protocols/protocol.h
@@ -25,6 +25,7 @@ public:
     void OnIncomingJson(std::function<void(const cJSON* root)> callback);
     void OnAudioChannelOpened(std::function<void()> callback);
     void OnAudioChannelClosed(std::function<void()> callback);
+    void OnNetworkError(std::function<void(const std::string& message)> callback);
 
     virtual void SendAudio(const std::string& data) = 0;
     virtual void SendText(const std::string& text) = 0;
@@ -39,6 +40,7 @@ protected:
     std::function<void(const std::string& data)> on_incoming_audio_;
     std::function<void()> on_audio_channel_opened_;
     std::function<void()> on_audio_channel_closed_;
+    std::function<void(const std::string& message)> on_network_error_;
 
     int server_sample_rate_ = 16000;
 };
diff --git a/main/protocols/websocket_protocol.cc b/main/protocols/websocket_protocol.cc
index 70e433d6..078185ad 100644
--- a/main/protocols/websocket_protocol.cc
+++ b/main/protocols/websocket_protocol.cc
@@ -110,6 +110,9 @@ bool WebsocketProtocol::OpenAudioChannel() {
 
     if (!websocket_->Connect(url.c_str())) {
         ESP_LOGE(TAG, "Failed to connect to websocket server");
+        if (on_network_error_ != nullptr) {
+            on_network_error_("无法连接服务");
+        }
         return false;
     }
 
@@ -128,6 +131,9 @@ bool WebsocketProtocol::OpenAudioChannel() {
     EventBits_t bits = xEventGroupWaitBits(event_group_handle_, WEBSOCKET_PROTOCOL_SERVER_HELLO_EVENT, pdTRUE, pdFALSE, pdMS_TO_TICKS(10000));
     if (!(bits & WEBSOCKET_PROTOCOL_SERVER_HELLO_EVENT)) {
         ESP_LOGE(TAG, "Failed to receive server hello");
+        if (on_network_error_ != nullptr) {
+            on_network_error_("等待响应超时");
+        }
         return false;
     }
 
diff --git a/main/settings.cc b/main/settings.cc
index 70daf8ae..ec27ffb2 100644
--- a/main/settings.cc
+++ b/main/settings.cc
@@ -11,7 +11,7 @@ Settings::Settings(const std::string& ns, bool read_write) : ns_(ns), read_write
 
 Settings::~Settings() {
     if (nvs_handle_ != 0) {
-        if (read_write_) {
+        if (read_write_ && dirty_) {
             ESP_ERROR_CHECK(nvs_commit(nvs_handle_));
         }
         nvs_close(nvs_handle_);
@@ -37,6 +37,7 @@ std::string Settings::GetString(const std::string& key, const std::string& defau
 void Settings::SetString(const std::string& key, const std::string& value) {
     if (read_write_) {
         ESP_ERROR_CHECK(nvs_set_str(nvs_handle_, key.c_str(), value.c_str()));
+        dirty_ = true;
     } else {
         ESP_LOGW(TAG, "Namespace %s is not open for writing", ns_.c_str());
     }
@@ -57,6 +58,7 @@ int32_t Settings::GetInt(const std::string& key, int32_t default_value) {
 void Settings::SetInt(const std::string& key, int32_t value) {
     if (read_write_) {
         ESP_ERROR_CHECK(nvs_set_i32(nvs_handle_, key.c_str(), value));
+        dirty_ = true;
     } else {
         ESP_LOGW(TAG, "Namespace %s is not open for writing", ns_.c_str());
     }
diff --git a/main/settings.h b/main/settings.h
index bc4c4fe4..2273b5a8 100644
--- a/main/settings.h
+++ b/main/settings.h
@@ -18,6 +18,7 @@ private:
     std::string ns_;
     nvs_handle_t nvs_handle_ = 0;
     bool read_write_ = false;
+    bool dirty_ = false;
 };
 
 #endif