My iPod has crashed randomly four times so far in the weeks that I've had it. The screen flashes blue, and then it just crashes. Has this happened to anybody else? Also at school I took it out to use it once during snack, only to find that it had crashed again, but this time, it didn't show the Apple logo for about 30s. Will a restore fix these, or is it a hardware problem? Should I hold off on jailbreaking in case something happens or are these normal problems?