Integer overflow error?

[Iron Giant]

This is in the gold demo. Im around turn 50 when some battles go loopy: The sounds repeat rapid fire and the screen freezes. It always comes back but after it happens once, the mouse continues to freeze in the rest of the game and then even in Windows itself until I reboot.

One time I got an error: Integer Overflow. Most of the time there is no error message.

I went into another game to see if it happened there (MW4) and everything seemed smooth.

Any ideas?