diff --git a/tools/chatgui-android/app/src/main/java/com/utun/chat/data/RadioOverlayService.kt b/tools/chatgui-android/app/src/main/java/com/utun/chat/data/RadioOverlayService.kt
index 95b82ba1..424ac5e4 100644
--- a/tools/chatgui-android/app/src/main/java/com/utun/chat/data/RadioOverlayService.kt
+++ b/tools/chatgui-android/app/src/main/java/com/utun/chat/data/RadioOverlayService.kt
@@ -392,7 +392,7 @@ class RadioOverlayService : Service() {
         .build()
 
     private fun addOverlay() {
-        val wm = windowManager ?: return
+        val wm = requireNotNull(windowManager) { "window manager unavailable" }
         val v = TextView(this).apply {
             text = "\uD83C\uDF99"
             textSize = 21f
@@ -430,6 +430,12 @@ class RadioOverlayService : Service() {
             private var secondTap = false
 
             override fun onTouch(view: View, event: MotionEvent): Boolean {
+                if (destroyed || currentService !== this@RadioOverlayService || overlayView !== v || !overlayReady || pendingStop) return false
+                if (!MicrophonePermission.granted() || !ChatApplication.instance.configProvider.getRadioOverlay() || !canDrawOverlays(this@RadioOverlayService)) {
+                    removeOverlay()
+                    return false
+                }
+                try {
                 when (event.action) {
                     MotionEvent.ACTION_DOWN -> {
                         startX = params?.x ?: lp.x
@@ -482,46 +488,58 @@ class RadioOverlayService : Service() {
                     MotionEvent.ACTION_CANCEL -> {
                         latched = false
                         lastTapUpTime = 0L
-                        endTalk()
+                        endTalk(immediate = true)
                         return true
                     }
                 }
                 return false
+                } catch (e: Exception) {
+                    latched = false; lastTapUpTime = 0L
+                    removeOverlay()
+                    setStatus(R.string.overlay_show_failed)
+                    LogManager.addLog("ERROR", "RadioOverlay", "Overlay touch failed action=${event.action} x=${event.rawX} " +
+                        "y=${event.rawY}; own PTT cancelled: $e")
+                    return true
+                }
             }
         })
-        wm.addView(v, lp)
         overlayView = v
         params = lp
+        overlayReady = false
+        _isShown.value = true // addView может бросить после добавления окна: до rollback считаем окно возможным.
+        wm.addView(v, lp)
+        overlayReady = true
         positionDragged = false
         placeAtDefaultCenter()
-        _isShown.value = true
-        LogManager.addLog("INFO", "RadioOverlay", "overlay shown")
+        LogManager.addLog("INFO", "RadioOverlay", "overlay shown view=${System.identityHashCode(v)} x=${lp.x} y=${lp.y}")
     }
 
     /* Поправка по фактическим координатам окна учитывает системные отступы оверлея. */
     private fun placeAtDefaultCenter() {
+        if (destroyed || currentService !== this || !overlayReady) return
         val v = overlayView ?: return
         if (positionDragged) return
         if (!v.isLaidOut) {
-            v.doOnLayout { placeAtDefaultCenter() }
+            v.doOnLayout { if (overlayView === v && !destroyed) placeAtDefaultCenter() }
             return
         }
         if (positioningPending) return
         positioningPending = true
         v.postOnAnimation {
+            if (destroyed || currentService !== this || overlayView !== v || !overlayReady) return@postOnAnimation
             positioningPending = false
             val target = defaultCenter ?: return@postOnAnimation
             val lp = params ?: return@postOnAnimation
             if (overlayView !== v || positionDragged) return@postOnAnimation
-            val actual = IntArray(2)
-            v.getLocationOnScreen(actual)
-            val dx = target.x - actual[0] - v.width / 2
-            val dy = target.y - actual[1] - v.height / 2
-            if (dx == 0 && dy == 0) return@postOnAnimation
-            lp.x += dx
-            lp.y += dy
             try {
-                windowManager?.updateViewLayout(v, lp)
+                val actual = IntArray(2)
+                v.getLocationOnScreen(actual)
+                val dx = target.x - actual[0] - v.width / 2
+                val dy = target.y - actual[1] - v.height / 2
+                if (dx == 0 && dy == 0) return@postOnAnimation
+                lp.x += dx
+                lp.y += dy
+                requireNotNull(windowManager) { "window manager unavailable" }.updateViewLayout(v, lp)
                 LogManager.addLog("DEBUG", "RadioOverlay", "default position center=${target.x},${target.y} x=${lp.x} y=${lp.y}")
             } catch (e: Exception) {
                 LogManager.addLog("ERROR", "RadioOverlay", "default position failed: ${e.message}")
@@ -536,10 +554,11 @@ class RadioOverlayService : Service() {
         updateButtonColor()
     }
 
-    private fun endTalk() {
-        if (!talking) return
+    private fun endTalk(immediate: Boolean = false) {
+        if (!talking && !immediate) return
         talking = false
-        RadioAudioEngine.instance().talkEnd(RadioPttSource.OVERLAY)
+        if (immediate) RadioAudioEngine.instance().cancelTalk(RadioPttSource.OVERLAY)
+        else RadioAudioEngine.instance().talkEnd(RadioPttSource.OVERLAY)
         updateButtonColor()
     }
 
@@ -552,21 +571,27 @@ class RadioOverlayService : Service() {
     private fun dp(v: Int): Int = (v * resources.displayMetrics.density).toInt()
 
     override fun onDestroy() {
+        checkMain()
+        if (destroyed) return
+        destroyed = true
+        val owner = currentService === this
         serviceScope.cancel()
         removeOverlay()
-        starting = false
-        running = false
-        pendingStop = false
-        if (currentService === this) currentService = null
-        _isShown.value = false
-        if (_status.value == R.string.overlay_active || _status.value == R.string.overlay_starting) {
-            setStatus(if (ChatApplication.instance.configProvider.getRadioOverlay()) R.string.overlay_stopped else null)
-        }
-        LogManager.addLog("INFO", "RadioOverlay", "overlay destroyed")
-        super.onDestroy()
-        if (restartAfterStop) {
+        var restart = false
+        if (owner) {
+            starting = false; running = false; pendingStop = false
+            if (overlayView == null) { currentService = null; windowManager = null }
+            if (_status.value == R.string.overlay_active || _status.value == R.string.overlay_starting) {
+                setStatus(if (ChatApplication.instance.configProvider.getRadioOverlay()) R.string.overlay_stopped else null)
+            }
+            try { stopForeground(STOP_FOREGROUND_REMOVE) } catch (e: Exception) {
+                LogManager.addLog("ERROR", "RadioOverlay", "Foreground notification removal failed id=$NOTIF_ID: $e")
+            }
+            restart = restartAfterStop
             restartAfterStop = false
-            sync(ChatApplication.instance)
         }
+        LogManager.addLog("INFO", "RadioOverlay", "overlay destroyed owner=$owner windowRetained=${overlayView != null} restart=$restart")
+        super.onDestroy()
+        if (restart) sync(ChatApplication.instance)
     }
 }