Official comment
Electronic components can and do fail, but usually not within that short a time. Seeing the scroll position jump may certainly be an indicator of a problem with the encoder knob. It certainly could be cleaned, but we aren't authorized to provide you with instruction on repair or disassembly of your hardware. Please contact Pioneer DJ support in your region for instructions or information on having the unit serviced. I understand that this may not be convenient, but at least it would be covered by warranty.