After two months or so of play my keys are starting to make annoyingly loud mechanical noises. Not all keys are the same. It almost seems like if there were a damping material at the end of travel that it is failing because at the end of travel on the downstroke there is more of a plastic on plastic sound rather than a softened thud. I am also finding that there is a squeak on some of the keys in addition to the other sound. The noise is definitely not coming from the speakers but is strictly mechanical in nature. It is loud enough that it overpowers the softer moments in a performance and is making it unsuitable for public play. Another symptom is that if i slide off a fully depressed key and let it rise of its own accord some make a rattle type sound when reaching their natural position. It seems like some damping material has failed on the upstroke as well. These issues are getting progressively worse as I use the board. Is anyone else having this issue? What can be done to fix it? Do I have a lemon?