Has any had or know why i am having a problem with discovery HD  All other HD channels are fine  I am getting a dotted line through picture. I have had the 811 for about a month.  I had a problem when the channel banner was up but now it is all the time.  I  am using dvi output.  Is it a bad receiver? Signal strength is 95 on the transponder.  Tech support wasn't much help.  Should I insist on a new receiver?  Any and all ideas would be a help.
Thanks
Dan
				
			Thanks
Dan