Auto shut off feature stopped working

One of my favorite features of my Apple TV 4K, is that it shuts itself off after a couple of hours of no input. It also shuts my television off. I often fall asleep with the TV on, and it is nice to wake up to everything shut off, when I wake up, during the night. However, it has recently stopped doing that. It runs on and on and on for hours. I have also quit getting the question, “are you still watching?” I think there may have been a recent update, because my screensaver has changed back to the default “Aerial”. Is there someway that I can reset, so that it goes back to shutting itself off, and asking me if I’m still watching? I didn’t set this feature up to begin with. It, apparently, was the default.