diff --git a/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt b/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt
index 0ff9b25..dbedd5f 100644
--- a/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt
+++ b/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt
@@ -230,6 +230,8 @@ class MainActivity : AppCompatActivity() {
     @Volatile private var rollingLowStreak = 0
     @Volatile private var pendingForceEndpoint = false
     private val forceSwitchStreaks = 2
+    // 强切冷却(仅 speakerCheckHandler 线程访问,无需 volatile)
+    private var lastForceSwitchAtMs = 0L
     // C(最新者胜):每次投递滚动检测都刷新序号,队列里被超额的旧任务直接跳过
     @Volatile private var rollingSeq = 0L
     // 兜底残料:当前句子槽位最近一次滚动窗口声纹。整句判定因碎片算不出
@@ -787,22 +789,34 @@ class MainActivity : AppCompatActivity() {
                                                         rollingLowStreak >= forceSwitchStreaks
                                                     ) {
                                                         rollingLowStreak = 0
-                                                        val label = newLabel
-                                                            ?: SpeakerRecognition.nextAutoLabel()
-                                                                .also {
-                                                                    SpeakerRecognition
-                                                                        .fastRegistry
-                                                                        .addAuto(it, emb)
-                                                                }
-                                                        Log.i(TAG, "SWITCH-FORCE" +
-                                                                (if (deepLow)
-                                                                    " deep-low<${deepLowSwitch}"
-                                                                else
-                                                                    " streak>=$forceSwitchStreaks") +
-                                                                " label=$label" +
-                                                                " owner=sid$owner")
-                                                        uiHandler.post {
-                                                            onOnsetSwitch(label)
+                                                        // 3s 冷却闸(2026-09-16 实测:
+                                                        // 强切落地链要 1~2s 完成,期间
+                                                        // 下一个深低窗会再开一枪,日志
+                                                        // 双发;功能无害但去噪+防叠发)
+                                                        val nowMs = SystemClock.elapsedRealtime()
+                                                        if (nowMs - lastForceSwitchAtMs < 3_000L) {
+                                                            Log.i(TAG, "SWITCH-FORCE" +
+                                                                    " suppressed (cooldown)" +
+                                                                    " owner=sid$owner")
+                                                        } else {
+                                                            lastForceSwitchAtMs = nowMs
+                                                            val label = newLabel
+                                                                ?: SpeakerRecognition.nextAutoLabel()
+                                                                    .also {
+                                                                        SpeakerRecognition
+                                                                            .fastRegistry
+                                                                            .addAuto(it, emb)
+                                                                    }
+                                                            Log.i(TAG, "SWITCH-FORCE" +
+                                                                    (if (deepLow)
+                                                                        " deep-low<${deepLowSwitch}"
+                                                                    else
+                                                                        " streak>=$forceSwitchStreaks") +
+                                                                    " label=$label" +
+                                                                    " owner=sid$owner")
+                                                            uiHandler.post {
+                                                                onOnsetSwitch(label)
+                                                            }
                                                         }
                                                     }
                                                 }