I have 2 HD receivers (1 HD DVR and 1 reg. HD receiver). I also have a standard def. receiver. The standard receiver works perfectly with no problems, but the two HD receivers suffer sound drop outs. I am sure that I am not losing the signal because the picture never breaks up or is lost. Only the sound drops out. About every 10 min. or so. Has anyone else ever had this problem? If so, how did you fix it?