Do you have a iPod touch or iPhone and sonetimes it ethier shut downs or take you back to homepage well... I have a ipod touch and it does the same thing but here is a great fix my bro help me with
Make sure you have you your ipod connected to your computer once the iTunes store loads click restore(you all may know that now) but sometime it still dose'nt work well here's the thing if you have more than 3 mutiple things running on your computer you may get glitches
Mostly happens with skype,infinty SMS,ect.
If so email the companys they solved the problem