Hello. Bizarre behavior of my ATV 4K (2021). Many times, the image starts blurry for a few seconds then settles for clear. Mostly happens with YT and Prime Video HD videos. ATV is plugged in 2.0 HDMI port with a "supposed" Certified Upgraded HDMI 2.1. TV has 2 HDMI 2.1 ports. Should I connect the ATV in one of these ports? Thanks.