diff --git a/sundynix-desktop/frontend/src/lib/voice.ts b/sundynix-desktop/frontend/src/lib/voice.ts
index 5e19a37..a2f23b9 100644
--- a/sundynix-desktop/frontend/src/lib/voice.ts
+++ b/sundynix-desktop/frontend/src/lib/voice.ts
@@ -147,7 +147,7 @@ export class VoiceClient {
           if (m.final) {
             this.clearIdleTimer();
             this.setState("thinking");
-            if (this.conversation) this.armThinkTimer(); // 看门狗：任务失败/无 TTS 也能回到聆听
+            this.armThinkTimer(); // 看门狗:后端不回/任务失败/无 TTS 时别永远卡在"思考中"
           } else if (this.conversation && this.state === "listening") {
             this.armIdleTimer(); // 有声音活动 → 空转计时重来
           }
@@ -341,12 +341,17 @@ export class VoiceClient {
     this.clearThinkTimer();
     this.thinkTimer = window.setTimeout(() => {
       this.thinkTimer = null;
-      if (this.conversation && this.state === "thinking") {
+      if (this.state !== "thinking") return;
+      if (this.conversation) {
         this.cb.onError?.("等回答超时，继续聆听");
         this.send({ type: "start" });
         this.cb.onTurnStart?.();
         this.setState("listening");
         this.armIdleTimer();
+      } else {
+        // PTT:回待命并说清可能原因,别让用户对着"思考中"干等。
+        this.cb.onError?.("等了很久没有回答——可能后端任务没跑起来(dispatcher/模型未就绪)。去运行页看看这条任务的状态。");
+        this.setState("ready");
       }
     }, THINK_WATCHDOG_MS);
   }