You have the HDMI control protocol activated. I think Samsung calls is "CEC", so you need to look for that and disable it, likely on the TV.
I'm not too familiar with the newer ARC and CEC, I think that you can defeat them independently. If not, then you need to redo you connections to avoid ARC.
Other brands may have their own name for the same HDMI control scheme, if you need to kill it on PS4 and AVR, it may not be called CEC.