Seems to have happened in the last month or so. If I have it on my desk, it creaks when I put my hands on the keyboard, especially the left palmrest. Same with the trackpad. I get a very unpleasant creak instead of a nice click every so often when I use the trackpad. I tried tightening up the bottom plate, but that hasn't done anything. I really don't want to open it up and screw something up.