Screen glitches when scrolling.

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About two weeks ago my LG Harmony screen started turning black and white, looking like snow from old TVs, or taking an image from website and tiling it in 1/8 in × 1/4in rectangles over entire screen. It happens only when scrolling. I suspected GPU issue.
Then my son showed me screenshot of his Galaxy doing the same saying it started about 2 weeks ago.
Any idea if there was some update that may have caused this? Anyone know how to fix it?
Thanks

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