I have a JVC TH-A5 DVD Digital Theater System. Earlier today I turn it on and all was fine then all of a sudden it started making thudding and popping sounds (not from the receiver but from the speakers and sub). It also froze up to where I couldn't actively see if I was changing the mode or volume. I left it for a while and same thing then, I took the cover off and there didn't seem to be anything visibly wrong without taking it apart further. I got the receiver from a goodwills and had been using it it for about a year now.