I was playing music on my Ipod but some songs stopped suddenly after a few seconds and switched to the next song or returned to the menu. I played those songs on the computer and it was alright, there is nothing wrong with the files. I used a program called copytransdoctor(If I remember right) like someone said on a website and it found nothing wrong in my Ipod. Do you know why this happens? And how can I fix it?