Ok. So i was using my 2nd gen 6 gig ipod mini, and then i was searching through the music files. Whenever I found a song that i had bought/got for free off itunes, it just skipped it and then went on the to the next song. It would pause for about half a second, and then either return to the start screen, or go onto the next song! I was so surprised! But on my itunes music library, it played perfectly fine? whats wrong? please help