I was playing Disgaea 2 and around 2:30-40pm, my psp shut off. I turned it back on and it tells me to do somethings that you need to do when you first get your psp (such as setting the time, nickname, GMT). i set it back up and i check the system info and i still says 5.50 d3. but wen i tried playing disgaea 2 again, it shut down itself. i turned it back on and tried to play another game, Crimsom Gem Saga, and it also turn off. What does it mean?