How do you turn off "Shake to Shuffle" on 4th Gen Nano?? I just upgraded to a 4th gen from a 2nd gen. Does anybody know how to turn off the shake to shuffle? Not sure if mine is over sensitive, but the slightest movement has it changing songs. I have read that you can put the hold on, but that seems like a nuisance whenever you want to switch to the next song. Help Please!!