I just received my MBA 2013 this morning. This time the key pressure feels different on parts of the keyboard from my previous MBA's. On the right side near the enter button the keys feel a bit loose and grinds against the aluminum carved out holes for the keys. Not only does it make grinding sound, but it can also be felt that these keys doesn't touch so light as the others. Anybody has this experience and what do you suggest I do? Return it?