When executing an iso on the PSP, for what possible reason might be the cause when while executing a game, that when it attempts to load a certain stage or screen, that the game will just hang, crash before shutting down the system?

Because, I've been having this problem with a total of 2 games now: Rockman Rockman (when attempting either Elecman or Gutsman's stages) and Kenka Banchou: Badass Rumble.

Both these games, while loading a particular stage/ area, hangs the system before shutting the entire system down. This keeps happening at a particular points of in the game.(when attempting to access either Elecman or Gutsman's stage in Rockman Rockman, after the first fight in Kenka Banchou)

The CFW used is 5.00 m33-4 on a PSP2000 model.