Lately, I have been getting a loud pop of static when watching tv. Basically my VCR is my tuner and everything else goes thorough my receiver. I used to think it was something in the cable. Now it does it every now and then, but not as loud when watching a DVD. Everything is in a power strip and I don't think that any other wires are touching. Any suggestions on what else to look for? The receiver is a upper middle range Sony that is maybe three years old.