diff --git a/src/i18n/main.ts b/src/i18n/main.ts
index 129dca8..eb62d70 100644
--- a/src/i18n/main.ts
+++ b/src/i18n/main.ts
@@ -18,9 +18,13 @@ const mainI18n = {
     },
     t(key: string) {
       const keys = key.split('.');
-      let current: any = messages[this.currentLocale];
+      // 未知/非法 locale 时回退默认语言，避免 messages[locale] 为 undefined 导致崩溃
+      let current: any = messages[this.currentLocale] ?? messages[DEFAULT_LANGUAGE as Language];
+      if (current == null) {
+        return key;
+      }
       for (const k of keys) {
-        if (current[k] === undefined) {
+        if (current == null || current[k] === undefined) {
           // 如果找不到翻译，返回键名
           return key;
         }
diff --git a/src/main/modules/cache.ts b/src/main/modules/cache.ts
index f45a07c..4dee06b 100644
--- a/src/main/modules/cache.ts
+++ b/src/main/modules/cache.ts
@@ -413,7 +413,9 @@ class DiskCacheManager {
       cleanupPolicy
     };
 
-    this.saveConfig(normalizedConfig);
+    // 注意：getCacheConfig 是纯读取，处于播放/下载/歌词等多个热路径。
+    // 此处不再落盘（electron-store.set 每次整文件写 config.json，会造成写放大与文件争用），
+    // 持久化交由 updateCacheConfig / setCacheDirectory 等真正的写操作完成。
     return normalizedConfig;
   }
 
diff --git a/src/main/modules/downloadManager.ts b/src/main/modules/downloadManager.ts
index 5373bb9..1f960e0 100644
--- a/src/main/modules/downloadManager.ts
+++ b/src/main/modules/downloadManager.ts
@@ -484,13 +484,17 @@ class DownloadManager {
       }
 
       // Start download
+      // 注意：axios 默认只接受 2xx，403/410 会直接抛错进入 catch，导致下方"直链过期重新解析"
+      // 分支永远走不到。这里放行 403/410，让过期直链能触发重新解析（尤其是重启后恢复队列时）。
       const response = await axios({
         url: task.url,
         method: 'GET',
         responseType: 'stream',
         timeout: 30000,
         signal: controller.signal,
-        headers
+        headers,
+        validateStatus: (status) =>
+          (status >= 200 && status < 300) || status === 403 || status === 410
       });
 
       // Handle response status
@@ -498,6 +502,8 @@ class DownloadManager {
 
       if (status === 403 || status === 410) {
         // URL expired, request re-resolution from renderer
+        // 排空未消费的错误响应流，避免连接悬挂
+        response.data?.destroy?.();
         this.sendToRenderer('download:request-url', {
           taskId: task.taskId,
           songInfo: task.songInfo
diff --git a/src/main/modules/loginWindow.ts b/src/main/modules/loginWindow.ts
index 58b6afd..6bf63ae 100644
--- a/src/main/modules/loginWindow.ts
+++ b/src/main/modules/loginWindow.ts
@@ -6,7 +6,6 @@ import i18n from '../../i18n/main';
 let loginWindow: BrowserWindow | null = null;
 
 const loginUrl = 'https://music.163.com/#/login/';
-const loginTitle = i18n.global.t('login.qrTitle');
 
 /**
  * 打开登录窗口获取Cookie
@@ -29,7 +28,8 @@ const openLoginWindow = async (mainWin: BrowserWindow) => {
 
   loginWindow = new BrowserWindow({
     parent: mainWin,
-    title: loginTitle,
+    // 在打开窗口时求值，确保跟随当前语言（模块加载时 i18n locale 可能尚未设置）
+    title: i18n.global.t('login.qrTitle'),
     width: 1280,
     height: 800,
     center: true,
diff --git a/src/main/modules/lxMusicHttp.ts b/src/main/modules/lxMusicHttp.ts
index 2dd1842..bcd713d 100644
--- a/src/main/modules/lxMusicHttp.ts
+++ b/src/main/modules/lxMusicHttp.ts
@@ -42,6 +42,8 @@ export const initLxMusicHttp = () => {
       // 保存取消控制器
       abortControllers.set(requestId, controller);
 
+      let timeoutId: ReturnType<typeof setTimeout> | null = null;
+
       try {
         console.log(`[LxMusicHttp] 请求: ${options.method || 'GET'} ${url}`);
 
@@ -77,13 +79,14 @@ export const initLxMusicHttp = () => {
 
         // 设置超时
         const timeout = options.timeout || 30000;
-        const timeoutId = setTimeout(() => {
+        timeoutId = setTimeout(() => {
           console.warn(`[LxMusicHttp] 请求超时: ${url}`);
           controller.abort();
         }, timeout);
 
         const response = await fetch(url, fetchOptions);
         clearTimeout(timeoutId);
+        timeoutId = null;
 
         console.log(`[LxMusicHttp] 响应: ${response.status} ${url}`);
 
@@ -122,7 +125,10 @@ export const initLxMusicHttp = () => {
         console.error(`[LxMusicHttp] 请求失败: ${url}`, error.message);
         throw error;
       } finally {
-        // 清理取消控制器
+        // 清理超时定时器（fetch 出错时前面来不及 clear）与取消控制器
+        if (timeoutId) {
+          clearTimeout(timeoutId);
+        }
         abortControllers.delete(requestId);
       }
     }