Apple TV box turns off when leaving the room

Hi it’s a strange one but when I’m watching Apple TV through ATV box when sat on the sofa in front of the tv whenever I stand up and leave the room the Apple TV switches off and loses its input. The ATV box is connected to a Dennon Amp which is connected to the TV through HDMI arc. It’s like there’s a sensor that detects when I move that turns off the ATV box!!

Thanks in advance.

[Re-Titled by Moderator]

Original Title: Apple TV box switching off when I get up from sitting in front of the TV