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 53c4265d..c41d0898 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
@@ -12,6 +12,8 @@ import com.utun.chat.ChatApplication
 import java.util.concurrent.CompletableFuture
 import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.atomic.AtomicReference
+import java.util.concurrent.locks.ReentrantLock
+import kotlin.concurrent.withLock
 
 /**
  * Запись голосового сообщения/тест микрофона и отдельный плеер native Opus-файла.
@@ -54,6 +56,7 @@ class AudioRecorderManager {
     @Volatile private var captureRunning = false
     @Volatile private var captureFailed = false
     private val closing = AtomicReference<CompletableFuture<Unit>?>(null)
+    private val captureLock = ReentrantLock()
     private val playbackWorkers = ConcurrentHashMap.newKeySet<Thread>()
     val isTesting: Boolean get() = captureMode == CaptureMode.TEST && captureRunning
 
@@ -67,7 +70,8 @@ class AudioRecorderManager {
      * true — Android/native захват запущен; false — отказ с диагностикой и откатом принадлежащих ресурсов. */
     fun startRecording(channelId: String, replyTo: String = "", requestId: Long = 0, generation: Long = 0): Boolean {
         if (closing.get()?.isDone == false) { LogManager.addLog("WARN", "AudioRecorder", "record start rejected: cleanup pending"); return false }
-        return synchronized(this) { startCapture(CaptureMode.RECORD, channelId, replyTo, requestId, generation) }
+        if (!captureLock.tryLock()) { LogManager.addLog("WARN", "AudioRecorder", "record start rejected: capture lifecycle busy"); return false }
+        try { return startCapture(CaptureMode.RECORD, channelId, replyTo, requestId, generation) } finally { captureLock.unlock() }
     }
 
     private fun startCapture(mode: CaptureMode, target: String, reply: String = "", request: Long = 0, generation: Long = 0): Boolean {
@@ -192,14 +196,16 @@ class AudioRecorderManager {
 
     /** Длительность native в мс, -1 — отказ/запись отброшена после ошибки, 0 — нет записи.
      * Успех означает передачу подготовки в native, публикация сообщения подтверждается отдельно событиями. */
-    @Synchronized fun stopRecording(): Int {
-        if (captureMode == CaptureMode.RECORD) return finishCapture(true)
+    fun stopRecording(): Int = captureLock.withLock {
+        if (captureMode == CaptureMode.RECORD) return@withLock finishCapture(true)
         if (captureMode == null) releaseCaptureDevice()
-        return 0
+        0
     }
     fun cancelRecording() {
         if (closing.get()?.isDone == false) return
-        synchronized(this) { if (captureMode == CaptureMode.RECORD) finishCapture(false) else if (captureMode == null) releaseCaptureDevice() }
+        if (!captureLock.tryLock()) { if (captureMode == CaptureMode.RECORD) requestClose(); return }
+        try { if (captureMode == CaptureMode.RECORD) finishCapture(false) else if (captureMode == null) releaseCaptureDevice() }
+        finally { captureLock.unlock() }
     }
     fun isActive(): Boolean = captureMode == CaptureMode.RECORD && captureRunning
 
@@ -210,11 +216,14 @@ class AudioRecorderManager {
             LogManager.addLog("WARN", "AudioRecorder", "microphone test rejected: stream owns capture")
             return false
         }
-        return synchronized(this) { if (isTesting) true else startCapture(CaptureMode.TEST, "__test__") }
+        if (!captureLock.tryLock()) { LogManager.addLog("WARN", "AudioRecorder", "microphone test rejected: capture lifecycle busy"); return false }
+        try { return if (isTesting) true else startCapture(CaptureMode.TEST, "__test__") } finally { captureLock.unlock() }
     }
     fun stopMicTest() {
         if (closing.get()?.isDone == false) return
-        synchronized(this) { if (captureMode == CaptureMode.TEST) finishCapture(false) else if (captureMode == null) releaseCaptureDevice() }
+        if (!captureLock.tryLock()) { if (captureMode == CaptureMode.TEST) requestClose(); return }
+        try { if (captureMode == CaptureMode.TEST) finishCapture(false) else if (captureMode == null) releaseCaptureDevice() }
+        finally { captureLock.unlock() }
     }
 
     @Volatile private var playing = false
@@ -222,7 +231,7 @@ class AudioRecorderManager {
     private var playThread: Thread? = null
     @Volatile private var playGeneration = 0
 
-    @Synchronized private fun forgetIfIdle() {
+    private fun forgetIfIdle() = captureLock.withLock {
         if (captureMode == null && audioRecord == null && playbackWorkers.isEmpty()) owners.remove(this)
     }
 
@@ -241,7 +250,7 @@ class AudioRecorderManager {
                 var retryMs = 250L
                 try {
                     while (true) {
-                        val released = synchronized(this) {
+                        val released = captureLock.withLock {
                             if (captureMode != null) finishCapture(false) else releaseCaptureDevice()
                             stopPlayback()
                             captureMode == null && audioRecord == null && playbackWorkers.isEmpty()
diff --git a/tools/chatgui-android/capture-tests/src/test/kotlin/com/utun/chat/data/AudioRecorderManagerTest.kt b/tools/chatgui-android/capture-tests/src/test/kotlin/com/utun/chat/data/AudioRecorderManagerTest.kt
index bb5fabcc..09b1f09e 100644
--- a/tools/chatgui-android/capture-tests/src/test/kotlin/com/utun/chat/data/AudioRecorderManagerTest.kt
+++ b/tools/chatgui-android/capture-tests/src/test/kotlin/com/utun/chat/data/AudioRecorderManagerTest.kt
@@ -126,6 +126,7 @@ class AudioRecorderManagerTest {
         val worker = Thread(stopped, "voice-stop-race").apply { start() }
         try {
             assertTrue(device.stopEntered.await(1, TimeUnit.SECONDS))
+            assertFalse(manager.startMicTest())
             leave.countDown()
             assertEquals(-1, stopped.get(1, TimeUnit.SECONDS))
             assertEquals(0, NativeLib.stops.get()); assertEquals(1, NativeLib.cancels.get())