I've no idea if this is a bug, or the AI trying to apply some sort of suppressive fire, so I'm just going to put it up here.
So I was playing a pretty bog-standard 7/7 Random Mod/Random Mod game (note: contra the wiki, One-Way Doormasters are Moderate types, not Easier, and annoying as ****), with no champions, when I saw something for the first time in my admittedly limited experience saving the galaxy: there would be stretches where the AI would randomly detonate EMP guardians on its planets (and cause em to freak out whenever the warning appears, only to realise the AI emp'd its own planet). Has this happened to anyone before? And why does this happen?