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 6f12324..5eda3f1 100644
--- a/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt
+++ b/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt
@@ -250,6 +250,9 @@ class MainActivity : AppCompatActivity() {
     private val forceSwitchStreaks = 2
     // 强切冷却(仅 speakerCheckHandler 线程访问,无需 volatile)
     private var lastForceSwitchAtMs = 0L
+    // 快速通道连续低分计数(同上,单线程访问)。2026-09-16 现场:2s 窗
+    // 垃圾窗孤发(负余弦都出现),单窗判决分不开换声与噪声 → 连续两窗闸
+    private var fastRollLowStreak = 0
     // 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
@@ -748,12 +751,21 @@ class MainActivity : AppCompatActivity() {
                                     tailF, sampleRateInHz) ?: return@post
                                 if (rseq != onsetSeq) return@post
                                 val sim = SpeakerRecognition.similarity(emb, anchor)
-                                if (sim >= fastRollDrop) return@post
+                                if (sim >= fastRollDrop) {
+                                    fastRollLowStreak = 0
+                                    return@post
+                                }
+                                fastRollLowStreak += 1
+                                if (fastRollLowStreak < 2) return@post
+                                fastRollLowStreak = 0
                                 val active = activeLabelForWindow
                                 // 先查注册表:认出当前人 → 销案(白捡的防护);
                                 // 认出别人 → 复用其编号;彻底陌生才发新号
                                 val known = rollingSpeakerSearch(emb)
-                                if (known != null && known == active) return@post
+                                if (known != null && known == active) {
+                                    fastRollLowStreak = 0
+                                    return@post
+                                }
                                 val nowMs = SystemClock.elapsedRealtime()
                                 if (nowMs - lastForceSwitchAtMs < 3_000L) {
                                     Log.i(TAG, "FASTROLL suppressed (cooldown)")