I bought my 3rd generation iPod Touch yesterday from Best Buy (my first touch, only had iPod Classics before), and I already have a problem! It has been working fine, until earlier today it wouldn't turn off properly. I press and hold the sleep button - normally, I release it and it has me slide the slider to turn it off completely - but now, it doesn't show the slider, instead it goes black like it goes on sleep or turns off. Is it turning off? Is it going to drain my battery? Thanks!