I supply my locals from a roof top antenna and have for over a year on my Hopper 3. Now all the locals are bizarre. They begin OK but after a few minutes the dialog is gone, the volume goes up and down, music is heard and other unidentifiable weird stuff. Fortunately, my TV has a tuner so I can receive all my locals on my TV. What could cause this other than an OTA adaper gone nuts? Anyone experience anything like this?