I turned my TV on and all of a sudden had the same issue with the picture only in the top left quadrant and blurryness and glitches in all other quadrants. The Netflix and ESPN home pages filled the entire screen but when I would try to watch a selection, the choice would resort to problematic picture. After trying Settings and everything to no avail, I held down the power button and it did a soft reset. Turned it back on and all is well and no issues. Hope this helps.
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