I've noticed that all of a sudden, my iPhone 5 will get crazy hot and then the battery will die absurdly fast. Like, I got the 10% battery warning after using it for 2 hours. According to the Battery Usage screen, it had been in standby for all but 2 minutes of those 2 hours. I'm thinking that there is a process that is going haywire. I killed all my processes in the multitasking bar, but the problem is still happening. Any suggestions?