LiveKit Community

```livekit-client: 1.6.5
livekit-server-sdk: 1.1.0```

hi!
it would be great to have a bit more info around this:
what OS are you seeing this on?
Can you paste the full livekit-client logs shortly before and after this happens, with debug logging enabled (also including the whole error message)?

Hi <@U02EU2ZPTQU>

We are facing the issue with restart tracks in both *iOS* and *Android* occasionally.

The browser log while facing the issue is " *Uncaught (in promise) DOMException: Could not start video source* "

For following code

restartTrack({
        facingMode: "environment" ,
      }

thanks, this is likely a `NotReadableError` which points to hardware/OS level problems (see <https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/getUserMedia#exceptions>). This error could also surface if the device is in use already.
there’s unfortunately not much we can do about this. Would be best to put the method in a `try/catch` clause and either retry or give up depending on your needs