RB15 keyboard key coating seems to be coming off on the edge of the space-bar after only 3 weeks of use. It's very faint in certain lighting but very noticeable in other lighting. I've tried taking a photo but it's hard to get something sharp. Is anyone else having this issue ? On another note, my enter key seems to be very "tinny/rattly" when pressed. it doesn't have the same resistance as the other keys. Is this normal?