My iphone shuts off randomly (5-10 times a day) and requires a reset or plug in with a usb to turn back on. It does not reset when plugged in via usb. I jailbreak'd it using pwned to v2.2, I restored it to see if it would happen again..it didn't. Anyone know why jailbreaking might be causing this? I want to jailbreak it. Any ideas? Thanks!