I am suddenly having a problem with my receivers.(1 HD DVR, 1 HD receiver and 1 non HD Reciever). On some channels I am getting a searching for satelite 771 message. It just started the other day. The weather is clear but we are in a very cold spell (teens and below). It started out as pixelated channels and now those channels just don't come in. The channels not effected come in perfectly. I had my HD DVR check the transponders and there were two that were 86 but all the rest were between 94 and 98. Service dept. says they can't come out for two weeks. There is no snow on the dish and no trees in the way.