My phone has had a few problems, mainly with the keyboard, but yesterday, while I was on a call, the phone spontaneously cut off the call and then the screen stayed black. The touchscreen was still working--I could feel the vibrations and things--but I couldn't see anything. I turned the phone off and then turned it back on, and again, the screen was working but I couldn't see anything. I tried taking out the SD card, putting it in safe mode, and nothing helped. The battery/SD card are now getting hot really, really fast, too. It was so spontaneous that I have no idea what's going on.