The past 3 days I have been having a reception problem with Sat. B (Directv) at 119 degreees. I receive digital (with a separate antenna) fine and I receive Sat. A at 101 degrees. Do not have Sat C installed. The signal from Sat B comes and goes between 97 and zero! It will be at zero for several minutes beofre coming back to 90's. The receiver seems to be ok. My dish has not been moved. Could it be the LNB for the B satellite? Any opinions, suggestions apprecaited.