Hi, I have an iphone 3gs and have been amazed at how easy it has made my life, doing just about anything I want it to. For a few weeks now it has been acting up and powering down itself. It does not turn back on, only the apple icon in the middle of the scrren is showing. Eventually it comes back up but its taking longer and longer and its happening more often every day now!! Help, I can't afford to buy a new one and don't want to buy a cheaper phone.