This is a first ... I had to shut down my PMS to stop music from playing. The Apple TV remote was working because each time I pressed the button to pause I could see the light flick on on the Apple TV.
Apple tvOS software version 10.0 (14T330)
Plex app version 1.4 (3435)
PMS version 1.2.2.2857
Brief description:
I was playing an album, all playing as normal. I then decided I wanted to stop playing so I tried to pause the track but there was no response from the Apple TV remote, excpet obviously it was sending the signals ok to the Apple TV as I could swipe right to the next track.
Clicking the menu button also went back to the Plex home screen but there was no way to stop the music playing.
I shut down (via Sleep) the Apple TV and turned it on again but the music continued to play.
I then shut down the PMS.. Still the music played when the PMS came back up.
I then shut down (not sleept) the Apple TV, rebooted the PMS, booted on the AppleTV and all seems ok.
Not sure if that makes it a tvOS bug or a Plex app bug.