I have unplugged it and plugged it back in, I have reset it to factory settings, and I bought a very good HDMI cord. I don't know what the issue is or how to resolve it
Apple TV 4K, tvOS 17
If the Control Center sleep timer wasn’t set, and no-one else in the vicinity has a remote to shut it off, then the only other things that I can think of, is overheating or a power issue. Could it be that the Apple TV box gets very hot, is insulated by a confined space, or is not on a flat surface (there is a fan at the bottom that needs air circulation). Could it be that the AC power gets interrupted? Small devices have small capacitors that may react to small (short) interruptions.
Certain apps may quit streaming for no interaction (“Are you still watching?”), and then the sleep setting for not streaming anything may kick in, but I suppose you would realize that, if such were the case.
Else contact the Apple Support staff for their take on this. Contact Apple for support and service (phone numbers) or start your support request online (chat/email/callback).
Is the status light on the Apple TV box still glowing, when this shutting off happens?
No. It completely turns itself off.
My 2018 4K Apple TV shuts off on its own in the middle of a program
