Sounds like you need some DeOxit. My Pioneer did the same thing PLUS the power switch was SUPER sticky. Like moving it through molasses. Picked up a small can from RadioShack and blasted the pots and switches. Do this with the faceplate off, obviously, and move the dials and switches the full range of motion to rub off some of the oxidation. It could take a couple of hours to a day for the effects to show fully. Good luck!