I've got Comcast digital cable plus HDTV, using the Motorola DCT 6200 and a Denon 3803 AV Receiver. I have a weird problem where, on the channels below 100, I get a periodic clicking sound through all of my speakers (5.1 surround). The sound is kind of like a static electricity sound you would hear if you touched a door knob and got a shock. I get it through the analog and digital inputs, as well as through the regular cable input, on my receiver. If I play a DVD, Gamecube, or CD, I don't have the problem, and it doesn't occur on channels higher than 100. Has anyone heard of anything like this? Should I just have my cable box replaced? Thanks!