Do you have 2 coax'es coming from your dish? Maybe the second coax is bad or there is a bad connector. This problem could be
be intermittent. The problem could only show up when it rains, it's cold or during the transition between a warm day and a cool
evening. I had this last problem occur when I still had cable. When we had a warm or hot day out and it was cool at night right
around dusk I would loose 4 - 5 channels and then the channels would come back after about 1 - 2 hours. The cable company
kept saying it was my house wiring but the neighbors had the same problem. That's why I said good by to cable and got satellite TV.