frame drops/screen freezes

[JnR444]

Hello guys, nearly two months ago I downloaded and started to play GTA Vice City Stories on PPSSPP. I do small configurations before downloaded it (4x PSP resolution to play on 1080p...) and everything was completely normal, game was running fine (Liberty City Stories too). But on this week, my PPSSPP started to act completely crazy, freezing the game and unfreezing, sometimes faster, sometimes slower. My PC setup was more than the necessary to play PPSSPP on factory configurations + 4x res (what comproves this is the two months playing normally with this configuration). Anyone know how to solve this? Game becomes unplayable.

Till now, I tried to: play on native resolution, reinstall the PPSSPP, install the latest one, reset all configurations. All got the same results.

Video of the problem: https://www.youtube.com/watch?v=Y8lRJe4Nlas

Sorry for any mistake and thanks to anyone who can help me.