I just had a pretty weird experience with Iridium Corporation on an insane sized map. The Corporation had a total power of 5800 at the time I had around 1000. They also had 4 times larger military and loads of planets. I was barely holding my own against them. Suddenly they proposed peace and right after that SURRENDERED to the Thalans!? I am allied to the Thalans and they had total power of 150 and maybe 10 planets.

I'm not really wondering about the Thalans but the fact that the leading civilizations just suddenly quits the game. I tried re-doing the turn but it seems that the surrendering happens anyway. Has anyone else experienced something like this?