I have a VP722K receiver that has not been used for several months. Subscription is current. When I try to use it now it will not let me view any of my subscribed channels. I can not even get the program guide to come up. It will load the interactive game, but that is all. Signal is strong, over 100 on both 110 and 119 sats. Tried power off and reset. Talked with Dish phone support, who could barely speak English. No joy. Help please.