pixilating, freezing on NFL - Red zone related??

I have two receivers in one room (gotta be able to watch two games at one time), and after I had the second receiver installed, the first one started pixilating sometimes- always during Sunday NFL games.  Not all the time, just sometimes. I finally figured out that when I put the new receiver on the Red Zone Channel, the other one will start pixelating, skipping etc.  If I change the channel on the second receiver to something else, picture on the first receiver is fine.  they are both on the same satellite with separate cables running to them.  Never had this problem before the second receiver was installed.... any suggestions??