What happens if you swap the two satellite input cables? Does the problem move to Tuner 2? If the problem moves to Tuner 2, then it's not the DVR's problem but rather a problem with the signal on that cable from the dish. If the problem stays on Tuner 1, then it's probably the DVR. Also be sure to swap those cables with and without swapping the B-Band Converter (BBC) module to rule out a defective BBC.