Your Apple TV is doing something odd.
Here is what is actually happening.
Short, tested answers for playback, sound and remote problems. Each guide names the hardware and tvOS version it was checked on, and tags every fact as measured or documented.
Video playback
MKV, HEVC, Jellyfin, Kodi, Infuse: what plays natively and what needs an app.
Sound and surround
No audio, passthrough, Dolby Atmos, DTS and TrueHD: what Apple TV really sends to your receiver.
IPTV players
M3U and Xtream playlists on Apple TV, compared on facts.
Remote and resets
Siri Remote not responding, pairing, and restarting or resetting the box.