I have a Series 3 HD using just cable no cable cards and the problem I have is at times the sound will go out for a second maybe 5 or 6 times a minute. It doesn't always happen and it can be any channel. I have good signal and I talked to TIVO and they had no answer but to swap it out for a another one at a cost of $150. I found one on Ebay brand new for $80.00 and thought this would fix it because my Premier and Series 2 work great no problems. I installed it and guess what same thing with then new one. Has anyone had this problem please help?