hughes SD-DVR40  I recently moved in with a new roomate who already had direct tv.  I turned my service off and added my reciever to his account.  It is a dual tuner.  He only had one coax line coming into the room. so I got a line splitter.  It seems to work except for one issue.  there are a certain number of channels that work fine.  There are another set of channels that only work if a channel from this group are on both recievers.  for instance I can watch espn on one tuner 1 and espn 2 on the tuner 2, but if I change tuner 2 to scifi tuner 2 says searching for signal, it also does this if I turn tuner 2 to NFL network. but if I put tuner 1 on NFL network and tuner 2 on scifi then they both work.  Has anyone ever had anything like this happen?  Directv is no help.  All they want to do is send someone out and charge me.  I tried getting a new splitter that has let splits in it and that does not help either.  Please help me this is driving me nuts and keeps my DVR from recording a lot of my scheduled programs.