I just got my Ipod touch a week ago. I went running one day and it just shut off, I truned it back on and everything seemed fine, but I went to go to my music and the screen goes white like everything is erased. I plugged it back into my computure to try to sync it again to see if my songs would go back on to it and it says they are already on it. What can I do? Or do I have to get a new one?