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High pixelation on channels 616, 617, 618, and others
Check all coax connections. Loosen then tighten them again. Could also be a bad splitter, or a bad box. Mine did that when the box went bad. Wouldn't properly tune a group of channels on the same base frequency. You could also check the SNR on the bad channels by tuning to them and going to settings> systeminformation. Could also be a temporary broadcast problem.