I just purchased an unlocked/jailbroken first gen 2g iphone and whenever I start up an app it runs for a few minutes and then the phone shuts down and says there is no power. As soon as I plug it in to my computer it says the power is full. If I have the phone plugged in while running apps it is fine. I have restored the iphone and re-jailbroke it but the problem still persists. Just so you should know when I got the phone both installous and cydia were already installed on it, so could that what has been causing the problem? Any help is appreciated. Thanks in advance!!!