Hi, just thought i'd mention an AI bug I've seen in game, it may have been mentioned already and if so I apologize.
It is super annoying. The opposing factions fleet seems to freak out, and just travel between two star systems, going back and forth between them infinitely, if this happens they pretty much become useless the whole game. Not defending our resettling planets they've lost. I play against unfair opponents usually.
Another bug i've noticed is the disappearing Ship bug, usually a capital ship, it just seems to disappear but still stay in fleet, and u can't do anything with it to get it back, ultimately causing me to salvage and rebuild my lvl 9 or 10 capital ship.