So I have a SP-540v and it has been a (slow) work horse for many years but for some reason here lately it seems like I am having to take apart, remove encoder strip and clean it constantly. Usually takes 2 cleans to get it going right and it will work good and then roughly a week later, same thing. I have flipped the old one over and after that didnt seem to help I just bought a new one. Stuck that one in and I have the same problem. Could there be another issue going on here? Doesnt seem to have any bad over spray, clean shop, not over worked, out of ideas.