I have 2 DTV HDVR2 Tivo receivers hooked up to DirecTV, valid account and all that but I have the weirdest problem... if I run 1 cable from the LNB to either sat 1 or sat 2, it works fine. But if I run 2 cables, the sat 2 line is intermittent and doesn't work. I can swap cables 1 and 2 as single cables and they work fine, but when I put both in the DVR, the sat 2 signal gives me problems. I even tried this with a second HDVR2 receiver and the same thing happened. Anyone know what the problem is? I don't have a grounding block on the cables - they're going straight from the sat dish to the DVR. I can't figure out what's wrong.