Very minor issue I'm seeing on latest TestFlight version in iOS. Here is how to reproduce.
1 - watch a channel then slide the volume control to the left so that there is no audio (mute)
2 - select the Done button to close the video and go back to the guide
3 - select a different channel to watch
4 - video plays with audio not muted even though the slider control displays as all the way to the left (mute)
5 - touching the volume slider slide to the right a bit (vol>0) the audio goes to zero then volume starts tracking with the slider position
Like I said minor issue.