Last night I noticed that something inside my Lexar SD Card rattles when it is gently shaken. It works, reading/writing as before, but I contacted Lexar an they are going to replace it. So today when I am reorganizing my cards, I noticed that 2 of my other cards also rattle. Not as much and only when in one direction but they still rattle. Does anyone else's cards do this and has anybody ever had any problems come from this?