I have started to have a problem with the rca conections for my cd player. They are a fairly good quality. Heavy, 24" long, gold plated tips. The problem is that periodically the sound will fade to a very low volume and get dull. It is still there, but faint. I can fix it by just giving the cables a small twist. They cables seem tight, but this keeps happening. Could it be oxidation or something on the terminals ? The cables have not been getting yanked or anything.