My 5th generation video iPod rattles in my iGroove when I play tunes with deep bass, even at relatively low volume. I have tried adjusting the rubber slide thing in the back, and it has some effect. But I can't get the rattle to go away no matter what position I choose. I know the iPod rattling is the problem, because if I steady it with my finger, the rattling goes away. Does anybody have the same problem? A solution?