My iphone crashes constantly during 'heavy' apps like games. During gaming the screen freezes with this kind of image: Then it reboots, or tries to, or reboots over and over again or on one occasion, completely froze my iphone. The screen turned black afterwards with the screen backlight slightly on. A hard reset didn't work by pressing the Home/Sleep buttons. Didn't respond to anything. All that was left to do is to completely let it run out of battery power. Which didn't take long as the backlight of the screen was slightly on. Then it had no choice but to really shut down. I then attached the cable to my computer, pressed the Home button and now it responded again, but of course with 0% battery power. While gaming it kept on freezing with about screen and gave me plenty of reboot screens. Luckily it didn't completely froze. I thought it was because of an game I recently bought but it also happened with older games. I then restored my iphone. Reset my apps with icloud. During downloading and installing of my backup apps it kept on freezing with similar screens and rebooting. Took me a while to hard reset (that still worked) and finally all was downloaded and installed. Now it has worked for a while, which hopefully it keeps on doing. But what could be causing my screen freezes and continuous reboots?