Apple TV status switching between idle/standby

My Apple TV keeps switching from idle to standby and back everytime.
It happend since I’ve added my Apple TV to home assistant.

How is everything connected:
TV → Soundbar → Philips Hue HDMI Sync box → Apple TV

Does anybody have this issue as well or had it?
And does anybody know where to check and/or have a solution?

Thanks in advance!