My ds lite has been sitting unused for a few months. I have an iTouch DS flash cart with the latest updated firmware. Before I started using it again recently, it was working fine. Now, it shuts off at random intervals while playing a game. I charged it all last night, and this morning it shut off about 4 times in a row. I also just formated the micro sd card before I installed the latest firmware. Does anyone know how I can fix this? Also, I'm the second or third owner, because I got it used at the local gamestop.