Random freezing on games w/ region mod...

[goombakid]

I IC region modded my PCE Duo a while back (I made it with 4551's). During preliminary tests, the console worked fine. Finished a full game of SFII' with 2 different characters in one sitting.

However, once in a while, it'll freeze up a game. I've had it freeze up on Bonk's Revenge on the second stage. I also have an Everdrive that I use. Again, playing Jackie Chan, the game froze up on a level.

Would the region mod be doing this? I'm powering the IC mod from the 7805. If it is the region mod, then it SHOULD be easy to remove, right?