Take the battery out, put it back in. Change UMD ISO Mode to Inferno in VSH menu. Disable any plugins. Update OFW. Update CFW. Try using another battery. Reformat memory card. Try using another memory card. There might be possible corruption of the the ISO file, delete old image, rip/download the game again. PSP Go internal memory may be getting too old. PSP memory card port may not be reading memory card.