Hello, I had a very similar problem With the same keyboard. Ultimately, I had to have the keyboard replaced. What started as a single key “bouncing” Itself multiple times, ended up with the X key completely stuck in the on position, no matter what I did including taking the key off of the keyboarding and cleaning everything with alcohol. Apple was incredibly helpful with the exchange, they could not find my keyboard serial number in their system, so they just sent me a new one without requiring the old one in exchange. I have, with this new keyboard, purchased a Cooskin Keyboard cover from Amazon, and I used cell phone repair double sided tape to adhere the cover to the keyboard, which I highly recommend, because the tape that comes with the cover is not that good at all. Also, I highly recommend that brand over the Silicone type covers for several reasons: The silicone type are much thicker, and they seem to tear easy. The Cooskin will cost you a couple of extra dollars, but trust me it is well worth the...