Guys, I noticed that my MacBook Air 13 inch late 2011's case bottom clicks when I slide my hand under it and lift it. It kinda sounds like a mouse click or the case is flexing. Has anyone else ever heard of this. It is still under Apple Care until until January 13th of this month. I have seen a thread about a spring that flex inside the case, but I'm not sure if this is the same thing. This Mac is in perfect shape and has always been used in a Mac Air Jacket. This is not a giant big deal but it is a bit annoying. Any impute would be great. Thanks