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Tks for quick reply, I did reboot last night and again this morning I was getting full screen of pixels, I rebooted again and had same problem. I tried my second box in bedroom and that channel was working fine there. I decided to disconnect and reconnect coax on the living room PVR and now that H2HD channel is working fine.
After that, I went all around the house and disconnected and reconnected all the coax junctions just in case.
Fingers crossed, knock on wood, seems that problem is resolved for now.