Phantasy Star Portable 2

[Aurani]

My game randomly locks up for a reason I can't figure out, the screen freezes but I can still hear music and speed unthrottle works (I can hear the sound speeding up) but nothing changes on-screen, not even the FPS/Speed counter.
So far my game has frozen in the main menu when I tried moving the selection, once when I joined a friend's party and once in the middle of a mission when I was doing stuff in my inventory.
Is the Phantasy Star games just this buggy or is there a specific setting that completely screws the game over? I've had no problems with other games so far.
I'm using PPSSPP v1.0.1 x64 on Win7 SP1 x64 playing ULUS10529.