Reply to filter knob on deck B malfunction...

Hey guys and gals, I've had my S4 for about 3 mo. And I love it, but just recently I turned it on ready to have some fun and my filter knob is going crazy. It's going back and forth randomly affecting the loaded track. It's showing on the software and controller that there is a midi signal being sent and received. I have reloaded the software anddrivers and still no luck. I'm Comming to the experts for any other advice as to how rectify the problem and get me back to creativity. All advice and suggestions are most welcome. And thanks in advance to everyone.