About 2 months ago, while using GPS, my phone overheated and shut down. The phone would then start rebooting when I touched the screen. It didn't matter what the program was, or what I was doing. The problem got progressively worse. Flashed other versions, did factory resets, etc. Nothing worked. I finally bought a new battery online and it has been working perfectly. Today, I dared to use the GPS again, and the phone overheated, again. I just turned it back on and just like two months ago, it is randomly shutting down or rebooting when the screen is touched. Is this an issue with Xperias? I feel like I've bought a piece of junk!