My setup is Plex 188.8.131.5252 on Ubuntu server, streaming to an Apple TV (tvOS 11.0). With one movie in particular the sound will just stop while the video continues. If I pause and play, the sound will start up again. If I watch through web client, it seems to play (and the sound is) fine. Only thing I notice different is in the plex logs, when streaming to the Apple TV, I see the following message periodically:
DEBUG - Failed to stream media, client probably disconnected: 32 - Broken pipe
Also, the audio doesn't stop at the same point every time. If I start from the beginning it will sometimes pause at 1:23, then the next time it will make it through 5 minutes, or 2, or...
It is highly reproducible with this one video, but as it just started yesterday, I'm not sure if other videos will also have this problem.
I've restarted the Apple TV. Restarted the Plex server.