Has anyone had issues with the HR20 searching for sat signal on very select channels?. Had the HR20-100 and it only did that on the Local HD where I would get one out of the four networks and it would be different each time. Talked to D* and they sent out a replacement HR20-700 and everything was fine for a couple of days then went to HGTV and it gave me the same message? I know the wiring and connections are fine (even hooked up the H20 and everything was good. Anyone else having these issues?