If your Apple TV keeps turning off without you doing anything, there may be a software or hardware issue. This problem can happen at any time, but there are a few solutions that can fix it.
5 Common Apple TV Problems and How to Fix Them
There are a number of reasons why your Apple TV might be turning off, regardless of which model you own. It could be that you simply need to reset or update it, or it could be something more serious.
Try the following solutions in the order presented to get your Apple TV working properly again.
Restart your Apple TV via the menu. First, go to Settings > System > Restart to see if a soft restart helps. Your Apple TV will turn off and then turn back on.