I just got a case, the Speck SeeThru Satin case for my 2012 13" MacBook Air and it seems to add quite a bit of weight and I'm afraid that it might spoil my hinge. With the case on if I close my Mac at about 45 degrees it seem to fall by itself to the point of closing by itself . Without the case I can close the lid about like 5cm from the base before it closes by itself. I hope this makes sense? So now I worry that the case might spoil my hinge even as I put my Mac on my bed it opens wider. Anyone has this problem ? Should I stop using the case? I'm quite disappointed about this and I can't return it...