Music playback stops when on repeat aTV HD

Currently using an appleTV HD in the bedroom (current TV OS 16) to stream a playlist of 3 songs on repeat as sleep sounds. A few weeks ago it began stopping very early in the morning (usually around 5am). Once it happens, I have to do a power reset to get the aTV to respond. I’ve been using an aTV to do this since the first model in 2006 (although files were stored locally so not a stream issue). I’ve reset the aTV, forgot & reset WiFi info, updated etc and nothing is resolving the issue. As it’s running through a Sonos surround setup & we listen at a high enough volume (we’re used to white noise to sleep with), the sudden silence jars me awake. Any ideas what may be going on? Never had this issue before a few weeks ago. Very frustrating.