I'm semi-new to the iPhone, I have a 16gig iPhone 3g, that's unlocked. for some reason my phone keeps randomly shutting off and restarting into safe mode. On top of thst it won't let me go into my pics and when I try and change my wallpaper the screen is blank. I have no freaking idea what's going on, the onl thing I can think of is some sorts memory issue, can someone please help?