Title explains it.
Once the AI hits ~5k to ~6k power not sure the exact point, the power rating overflows and resets to 0. The AI now believes it is a tiny civ facing imminent destruction and surrenders to another faction. The inheriting faction will soon reach the overflow point as a result of this. They too will surrender. This cycle will continue until the game ends anti-climatically.
This is a legitimate show stopper that I hope can be addressed via hotfix ASAP.
The following screenshot is someone else's screen shot of this happening. In this screenshot, the Iridium Corp broke the threshold in a game it was running away with in terms of power. After this screenshot it surrendered to the Thalan's who themselves went on to overflow and then presumably would have surrendered.
