My ipod won't play the previews in the itunes store. Well, it just loads them but it loads them for a long time and they just wont play. It also takes a while to download a song and an app. It just recently started doing this. I have about 20GB of free storage left on my ipod. I have tried restoring and resetting it, but it just wont solve the problem. Is anyone else having the same problem? or does anyone know how to fix it?