Usually a problem that only appears on some but not all channels are caused by your signal source. In my case with Brighthouse cable, it use to be with temperature changes, I was getting too strong a signal (and after a change in their system, too weak of a signal) for my higher numbered channels to not freeze or tile. They were over here last week to fix this problem and said that with what they are currently doing, the cable system would have to be tighter....which I took to mean more problematic as a cable system isn't a precise animal to start with. I'll be looking at satellite again as I think they're less likely to have these kinds of problems.
Samsung 64F8500, Panasonic 65VT50, Oppo 95, Tivo Roamio for OTA, Dish VIP722, Marantz AV8801 preamp, Rotel Amps, Atlantic Tech 8200 speakers, Seaton Submersive HP, Calman 5, Chromapure, Accupel DVG-5000, i1Display3pro, i1pro2, eecolor colorbox.