Me and a few friends have similar setup and are having the same problem. Every time when the other receiver is tuned to the same channel as the first one, the first one will freeze up and scrambled. I think this is a common problem but couldn't find a clear solution from anywhere. Anyone here has the same problem and solution ? Thanks.
My 2 receivers setup: 2 Dishes each with 2 Dual LNBs pointing at 82W 91W 110W and 121W. The outputs from each LNB go to a separate 4x1 DiseqC switch (DMS International), and from switch to receiver.