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Screen flicker intermittent new X1 box

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Screen flicker intermittent new X1 box

A few weeks ago I got a new X1 box installed, lately I’ve noticed that sometimes when displaying solid colors they flicker. The problem is intermittent and there seems to be no pattern. I have tried switching to a new HDMI cable and a different HDMI input. The problem doesn’t occur on my Apple TV, only on Comcast input so i assume it is an issue with the video source. Can anyone offer me advice or input as to why this is happening and what I should do? Thanks