About every five years I find I need to clean the switches and pots on the Yamaha troupe here. This is a strictly empirical, anecdotal (i.e., not objective nor scientific) observation, but I have the impression that the Yamaha controls seem to be a little more sensitive to oxidation/dirt than other brands'.
My 2010 has been losing a channel. It will drop out but come back temporarily if I turn the volume way up. Replace relay? Recap power board?