The picture jitters and pops off for a fraction of a second when I try watching at 2160p 4K. This happens on HD programming and 4k Netflix programming while watching TV through the X1 Xfinity 4k box.
Interestingly, if I watch 4k programming on Amazon Prime and Netflix apps through my LG 4K TV at 2160p 4K, the picture is awesome with no technical issues.
The Comcast tech suggested 4k cables. What I've read leads be to believe that the cable isn't the issue.
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