Shin Megami Tensei: Persona 3 Portable

[Tetsu]

Game works almost perfectly (30 fps most times). Most of my settings are the default ones (Buffered, Rendering 1x PSP, Frameskip off, Hardware transform on(Samsung S3 Mini).
At videos the sound becomes "choppy" and sometimes when 'special' effects are being used mostly in battles (like when you called your Persona for the first time) the fps drops to 15/20. Is there any way to fix it?