Phone Hard Reset On It's Own

[fozmsu]

I tried searching and can't find anything on it. Hoping someone can point me in the right direction. Yesterday when I tried to wake up my phone, the screen was all gray. It looked like how it does when you are flashing. I pushed the power button, nothing happened. I slid the keyboard open and my screen came back, but the colors were way off. It was as if I was looking at it through a filter or it was a photo negative. I soft reset and it came back fine. For the next few hours it worked fine unless I tried to access my sms and then the phone would freeze up. A few hours later, I went to use it and it was stuck on the black screen that says touch pro with the red info at the bottom. I tried soft resetting a few times and it came back the same. I let it sit for about 30 minutes, on that touch pro screen, and it finally hard reset by its self. Working without flaw now, but what caused this? Should I be concerned?

Edit: I am running stock sprint rom with latest MR. I have been using all apps for months now, so nothing new that could have caused this