diff --git a/tools/chatgui-android/app/src/main/java/com/utun/chat/data/AudioRecorderManager.kt b/tools/chatgui-android/app/src/main/java/com/utun/chat/data/AudioRecorderManager.kt
index a5dc4c28..84f0e88b 100644
--- a/tools/chatgui-android/app/src/main/java/com/utun/chat/data/AudioRecorderManager.kt
+++ b/tools/chatgui-android/app/src/main/java/com/utun/chat/data/AudioRecorderManager.kt
@@ -195,8 +195,9 @@ class AudioRecorderManager {
         if (captureMode == null) releaseCaptureDevice()
         return 0
     }
-    @Synchronized fun cancelRecording() {
-        if (captureMode == CaptureMode.RECORD) finishCapture(false) else if (captureMode == null) releaseCaptureDevice()
+    fun cancelRecording() {
+        if (closing.get()?.isDone == false) return
+        synchronized(this) { if (captureMode == CaptureMode.RECORD) finishCapture(false) else if (captureMode == null) releaseCaptureDevice() }
     }
     fun isActive(): Boolean = captureMode == CaptureMode.RECORD && captureRunning
 
@@ -209,11 +210,13 @@ class AudioRecorderManager {
         }
         return synchronized(this) { if (isTesting) true else startCapture(CaptureMode.TEST, "__test__") }
     }
-    @Synchronized fun stopMicTest() {
-        if (captureMode == CaptureMode.TEST) finishCapture(false) else if (captureMode == null) releaseCaptureDevice()
+    fun stopMicTest() {
+        if (closing.get()?.isDone == false) return
+        synchronized(this) { if (captureMode == CaptureMode.TEST) finishCapture(false) else if (captureMode == null) releaseCaptureDevice() }
     }
 
     @Volatile private var playing = false
+    private val playbackLock = Any()
     private var playThread: Thread? = null
     @Volatile private var playGeneration = 0
 
@@ -268,8 +271,9 @@ class AudioRecorderManager {
 
     /** Запустить со startMs, округлённого вниз до 20 мс; seek декодирует и отбрасывает предшествующий PCM.
      * Отрицательный startMs ограничивается нулём; прогресс учитывает только принятые AudioTrack сэмплы. */
-    @Synchronized fun playFromPosition(filePath: String, startMs: Int, onProgress: ((Float, Int) -> Unit)? = null, onComplete: () -> Unit = {}) {
+    fun playFromPosition(filePath: String, startMs: Int, onProgress: ((Float, Int) -> Unit)? = null, onComplete: () -> Unit = {}) {
         if (closing.get()?.isDone == false) { LogManager.addLog("WARN", "AudioPlayer", "play rejected: cleanup pending"); return }
+        synchronized(playbackLock) {
         stopPlayback()
         playing = true
         val myGen = playGeneration
@@ -332,7 +336,7 @@ class AudioRecorderManager {
                     }
                     val total = (skippedSamples + readTotal).toFloat() / totalSamples.coerceAtLeast(1).toFloat()
                     val eMs = ((skippedSamples + readTotal) * 1000 / (sampleRate * channels)).toInt()
-                    synchronized(this@AudioRecorderManager) {
+                    synchronized(playbackLock) {
                         if (myGen == playGeneration) onProgress?.invoke(total, eMs)
                     }
                 }
@@ -355,7 +359,7 @@ class AudioRecorderManager {
                     try { if (handle != 0L) { NativeLib.voiceDecodeClose(handle); handle = 0 } }
                     catch (e: Exception) { LogManager.addLog("ERROR", "AudioPlayer", "decode close failed generation=$myGen; retained: $e") }
                     if (!notified) {
-                        synchronized(this@AudioRecorderManager) {
+                        synchronized(playbackLock) {
                             if (playGeneration == myGen) {
                                 playing = false; playThread = null
                                 try { onComplete() }
@@ -380,16 +384,17 @@ class AudioRecorderManager {
             LogManager.addLog("ERROR", "AudioPlayer", "Playback worker start failed: $e")
             onComplete()
         }
+        }
     }
 
     /** Асинхронно остановить текущий worker; позицию для следующего playFromPosition хранит вызывающий код. */
-    @Synchronized fun pausePlayback() {
+    fun pausePlayback() = synchronized(playbackLock) {
         playGeneration++; playing = false
         playThread?.interrupt(); playThread = null
     }
 
     /** Инвалидировать callbacks и прервать worker; собственные AudioTrack/decoder он освобождает в finally. */
-    @Synchronized fun stopPlayback() {
+    fun stopPlayback() = synchronized(playbackLock) {
         playGeneration++; playing = false
         playThread?.interrupt(); playThread = null
     }
diff --git a/tools/chatgui-android/app/src/main/java/com/utun/chat/data/NativeLib.kt b/tools/chatgui-android/app/src/main/java/com/utun/chat/data/NativeLib.kt
index cb72f9e9..f00335ed 100644
--- a/tools/chatgui-android/app/src/main/java/com/utun/chat/data/NativeLib.kt
+++ b/tools/chatgui-android/app/src/main/java/com/utun/chat/data/NativeLib.kt
@@ -95,7 +95,7 @@ object NativeLib {
         return nativeUpdateSockets(configText)
     }
 
-    fun isReady(): Boolean = nativeIsRunning()
+    fun isReady(): Boolean = !coreStopping && nativeIsRunning()
 
     fun getMyNodeId(): Long = nativeGetMyNodeId()