A few days ago, HD channels started flickering black, then would go out. Then the message telling me to contact my cable service provider. You could switch channels, and usually it would pop back on. Then it became worse. After 7pm, most of the HD channels go black and sometimes the regular ones as well. Often they come back if you SLOWLY flip through the channels several times over. Under DVR diagnostics, it shows blank stats mostly under tuner 0 when the chanels go out. But tuner 1 is always fine. Just using a Comcast cable card. Tuner 0 says the cablecard association :None and shows current tuning status : Wrong card State. But tuner 1 shows everything is fine with the same cable card. Swapped out the cable card with another one. Everything is fine, the after 7pm it goes out randomly again. Then in the morning, it is working perfectly again and both tuner 0 and 1 all report normal stats. Is there a problem with the cable line? It reads signal strength between 99-100. The SNR reads 38db most of the time. Or is my Tivo about to expire?