diff --git a/ui/public/embed/dograh-widget.js b/ui/public/embed/dograh-widget.js
index 741cf189..65614cf7 100644
--- a/ui/public/embed/dograh-widget.js
+++ b/ui/public/embed/dograh-widget.js
@@ -633,6 +633,11 @@
       // Request microphone permission
       try {
         const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
+        // Release any stream still held from a prior attempt before retaining
+        // the new one, so a re-entrant start can't leak the microphone.
+        if (state.stream) {
+          state.stream.getTracks().forEach(track => track.stop());
+        }
         state.stream = stream;
       } catch (micError) {
         // Handle specific microphone permission errors
@@ -660,6 +665,31 @@
 
     } catch (error) {
       console.error('Dograh Widget: Failed to start call', error);
+
+      // Release anything acquired before the failure so a retry starts clean.
+      // getUserMedia may have succeeded before a later step (WebSocket /
+      // negotiation) threw, which would otherwise leave the mic held and block
+      // the next getUserMedia(). Null the refs before close() so the peer/ws
+      // state handlers short-circuit instead of re-entering teardown.
+      if (state.stream) {
+        state.stream.getTracks().forEach(track => track.stop());
+        state.stream = null;
+      }
+      if (state.pc) {
+        const pc = state.pc;
+        state.pc = null;
+        if (pc.signalingState !== 'closed') {
+          pc.close();
+        }
+      }
+      if (state.ws) {
+        const ws = state.ws;
+        state.ws = null;
+        if (ws.readyState !== WebSocket.CLOSED && ws.readyState !== WebSocket.CLOSING) {
+          ws.close();
+        }
+      }
+
       updateStatus('failed', 'Connection failed', error.message || 'Please check your microphone and try again');
 
       // Trigger error callback
diff --git a/ui/src/app/workflow/[workflowId]/run/[runId]/hooks/useWebSocketRTC.tsx b/ui/src/app/workflow/[workflowId]/run/[runId]/hooks/useWebSocketRTC.tsx
index 3a7ee3ee..f93e5f1b 100644
--- a/ui/src/app/workflow/[workflowId]/run/[runId]/hooks/useWebSocketRTC.tsx
+++ b/ui/src/app/workflow/[workflowId]/run/[runId]/hooks/useWebSocketRTC.tsx
@@ -70,6 +70,7 @@ export const useWebSocketRTC = ({ workflowId, workflowRunId, accessToken, initia
     const audioRef = useRef<HTMLAudioElement>(null);
     const pcRef = useRef<RTCPeerConnection | null>(null);
     const wsRef = useRef<WebSocket | null>(null);
+    const localStreamRef = useRef<MediaStream | null>(null);
     const timeStartRef = useRef<number | null>(null);
     const onNodeTransitionRef = useRef(onNodeTransition);
     const connectionActiveRef = useRef(connectionActive);
@@ -153,6 +154,16 @@ export const useWebSocketRTC = ({ workflowId, workflowRunId, accessToken, initia
         }
     }, []);
 
+    const stopLocalStream = useCallback(() => {
+        // Release the microphone so the device is freed for a subsequent call.
+        // Stopping the sender tracks via pc.getSenders() alone can leave the
+        // browser holding the mic, blocking the next getUserMedia().
+        if (localStreamRef.current) {
+            localStreamRef.current.getTracks().forEach((track) => track.stop());
+            localStreamRef.current = null;
+        }
+    }, []);
+
     const cleanupConnection = useCallback((options: CleanupConnectionOptions = {}) => {
         const graceful = options.graceful ?? true;
         const status = options.status ?? (graceful ? 'idle' : 'failed');
@@ -173,10 +184,12 @@ export const useWebSocketRTC = ({ workflowId, workflowRunId, accessToken, initia
             wsRef.current = null;
         }
 
+        stopLocalStream();
+
         if (options.closePeerConnection !== false) {
             closePeerConnection(pcRef.current, options.delayPeerClose ?? false);
         }
-    }, [closePeerConnection]);
+    }, [closePeerConnection, stopLocalStream]);
 
     const createPeerConnection = () => {
         // Build ICE servers list
@@ -743,6 +756,10 @@ export const useWebSocketRTC = ({ workflowId, workflowRunId, accessToken, initia
             if (constraints.audio) {
                 try {
                     const stream = await navigator.mediaDevices.getUserMedia(constraints);
+                    // Release any stream still held from a prior attempt before
+                    // retaining the new one, so re-entry can't leak a device.
+                    stopLocalStream();
+                    localStreamRef.current = stream;
                     stream.getTracks().forEach((track) => {
                         pc.addTrack(track, stream);
                     });
@@ -770,6 +787,7 @@ export const useWebSocketRTC = ({ workflowId, workflowRunId, accessToken, initia
     // Cleanup on unmount
     useEffect(() => {
         return () => {
+            stopLocalStream();
             if (wsRef.current) {
                 wsRef.current.close();
             }
@@ -777,7 +795,7 @@ export const useWebSocketRTC = ({ workflowId, workflowRunId, accessToken, initia
                 pcRef.current.close();
             }
         };
-    }, []);
+    }, [stopLocalStream]);
 
     return {
         audioRef,