I brought my brother's Ipod back to the store because the screen froze randomly while doing casual tasks (music, videos). First we did a hard reset, after that didn't work we made the software-update also with no success. Unfortunately I wasn't able to show the help-desk-worker the error because we don't know what caused it. She took it back without any guarantee they can fix it or will replace it. How good do you think our chances are they will replace it? Is this a known error?