Freezing/stop working

[Titan]

Ok guys im new here. Ok so i play gta vcs on ppsspp. Amazing quality and perfect speed. But, when i get to the mission "Brawn of dead", after a few seconds the screen just freezes. The emulator is running but the screen just freezes. Not only that but sometimes, it says ppsspp not working about 2/4 times. i have tried downloading different cso to see if that is the problem but no. PLz help!