i bought my nexus 7 tablet almost a year ago. I have used it quite a lot and I take the bus home and to school. The ride to and from them is a bumpy one and I think things started to shake around in my bag but I never had this problem before after going through so many rides. To the point, When I hold the tablet with both hands I can hear and feel the left side of the unit click as if the rubber piece is lifted out if it's place. I don't think it will bother me if I hear that it won't get worse but because of my ADD it bothers me a lot. Is there a way to fix it. and what is causing it. Is it a loose screw or have the points of where it gets secured to the rest of the unit worn out?