Ok, I've played both campaigns now. I agree that firing the Wave Motion Gun at a Gamilon Battleship causes the game to lockup.
It would be a good idea to reduce the firing points permanently if this is indeed the cause of the problem.
Over all, it was a reasonably interesting game. But it the Galactic News events are full of mispellings and clumsy English that makes me expect to see 'All your base are belong to us!" at any moment.
I take it that you are not a native English speaker? Or are you just copying the narration text from somewhere else? It really needs a bit of editing. Even mportant words like
Carrier are mispelled.
