freezing

I have been playing on very hard mode with people doing the ttf run but when I get to the Caves Boss it freezes. Can't move, interact, or quit the game. I have to force shut it down. Has anyone else had this issue?

Specifically during LBA that I know of so far. 3/4 of the last fights (having a hard time getting my HBR up :(). Upon entering I see him come down and then it's like the fight is going to start and everybody is standing still and I can't move. Music still playing. I know this is an older game...