So my iPhone 3GS on 4.2.1 crashes constantly. I will be sending a text, or playing a game and it crashes to a black screen instantly, with the image of what I was doing burned into the screen for a few moments (kind of like turning off a CRT monitor). When attempting to turn it on afterwards it shows the Apple logo but crashes during bootup, or else it will simply tell me my battery is dead, and I will proceed to plugging it in and then it says that the battery is at 50-100%. I did a full restore last night and when it was at 100% battery I played a game to cause it to crash (takes minutes), and then when it booted back up after plugging it in, it says the battery was at 56%! Anyone ever heard of these symptoms? I haven't seen anything on the net of the OS just crashing to a black screen with the image burned in, and then saying the battery is dead when it isn't. Any help would be appreciated, btw this has been going on for like 3 months and it has crippled my iPhone to be solely just an SMS machine.