I am having some problems with my Sony receiver. It model # STR-SE501. Lately, my receiver makes a click sound (the same sound it makes when you turn it on) and then the rear speakers quit working. After awhile, it clicks again, and the rear speakers start working again. After trying to switch the subwoofer cable, I found that by wiggling the cable where it is inserted in the receiver, it causes that click sound too. Any ideas on what it might be? has anyone tried to take a receiver apart?