I have i7 2011 13 inch macbook air. I noticed about a week ago that there is some play in the center of the hinge when the machine is closed. If you push on the center of the hinge there is a small bit of play when the machine is closed. The hinge seems tight when opening and closing the machine. The looseness is only in the center of the hinge. I looked at my macbook pro hinge and there is no play. Anyone else see this?