So I thought I had a fix but continues to happen if anyone has any ideas or a Samsung tech knows what's going on. I have seen many posts about this but really never got a solution. My Xbox series x on HDMI 4 and HDMI 3 of the Samsung q90a no matter what I seem to do will randomly not be supported sometimes does it even in the middle of a game. Anybody have any solutions I do have an HDMI 2.1 cord which is plugged into HDMI 4 that didn't seem to make a difference. Side note I also have the PS5 seems to work fine with the PS5 and either port.