Note: this is not a request for troubleshooting help.
For the past few years my 10ish year old “smart” TV will maybe once a week or so completely lose the ability to play sound in the Youtube app, and only in the Youtube app. Sound works just fine everywhere else. Bizarrely this is always triggered by an ad and never a video. Restarting the app doesn’t fix it, and neither does clearing the cache. Fortunately doing a full restart of the TV fixes it, it’s just irritating to have to restart because an ad somehow broke the sound.
What technological gremlins haunt you?
Do you, by any chance, have network extenders that send ethernet via an electrical socket? They send the ethernet signals through your electrical wiring, and if for some reason your bathroom light is on the same circuit as your sockets, then you might be getting some kind of wake on lan packet. Or what it thinks is a wake on lan packet.