Anyone here have any experience with the artist mix faders flickering rapidly between registering on/off on your touch of the fader? All faders work electrically, but some faders do the "flickering", 1 fader doesn't respond to capacitive touch in any way. I've cleaned the fader caps, took them off and tried them bare metal. I tried my softest, least calloused finger too - no change. perhaps a good cleaning would help? IM also considering a possible intermittent ground somewhere but it cycles so fast that doesn't exactly make sense. Love any troubleshooting advice you can provide.