When I had the Denon AVR-5308CI, I used the HDMI ARC feature/HDMI Control. It would sometime turn on by itself also.
So when I sold the AVR-5308 and replaced it with the RX-A3080, I made sure NOT to use the ARC input and turned anything related to ARC/HDMI Control to OFF.
Machines are gonna take over the world like in TERMINATOR if we keep on allowing all these automations!