No sound during playback on Apple TV

Channels on Apple TV worked fine yesterday. Today I tried to watch a show and there was no sound during playback. Exited from the show and verified that when I scroll around through the Channels app, I still hear the beeps associated with moving from item to item.

Still, there is no sound when you play a recorded show or watch live tv -- I tried multiple programs to test. I also tried doing sound just through TV just in case the soundbar was somehow at issue, but the behavior persisted.

I can also airplay from Channels on my laptop to the AppleTV and sound is fine (as it is if I watch on the computer).

Any suggestions?

Thanks.

Restart channels app? Hit TV/Home twice and swipe up.

Or reboot the Apple TV