I know that the default settings initiate auto-upgrades when new improvements are gained, either by research, trade, espionage, or conquest. I have no problems with that, and I can go undo them, generally, should I wish.
However, periodically, the game just decides ro re-visit all my colonies and do auto-upgrades.
This really POs me. I deliberately do not research Industrial Sectors or higher farms, but sometimes I end up with those techs anyway. So, when I get Industrial Sectors, for example, I know I have to go around and undo queues. The problem is that periodically the game just goes back and does it again, and again, and again. Not only is it a truly royal pain to ahve to go back and undo them again and again and again, but it is expensive as one turn social production is lost for each affected planet. This last game, the third time it happened it took me down below -500 and killed my carefully timed shipbuilds all over the map.
I have looked in all the various in-game screens and menus and have not found where I can disable that feature/bug. Am I missing it? Or, must I go into game files somewhere?