Hi, I got problem with mine iPhone 3gs, 32gb. When I use camera, surf the net, or use some apps(Facebook, Zynga poker, Tap Tap revenge) it turns off. Sometimes there are some lines at screen and sometimes it just turns off. If first case I have to hold power button for 10seconds to turn off. After that it shows me charge battery simbol and I have to connect it to power source to continue using it. Every time battery was >50%, so empty battery isn't real problem. I guess it's up to software(I'm at 4.3.5, baseband 05.16.02), not jailbroken or unlocked. Can you help me anyhow? Thanks everyone!