So can't say this has been in any way an issue. First time ever in current game, like just barely out of pre-warp stage, I had 4-5 worlds, and suddenly 2 of them decided to split off in a civil war.
Observation: was very unexpected as I'd never had a civil war before, and of the worlds I had, 2 were just recently conquered worlds and if any worlds were going to secede from my empire, I figured it'd be them. But nope, it was 2 of my own home grown colonies.
Also, new to me, was the as part of splitting off, the treacherous bastards randomly (so it appeared) took a number of my fleet ships with them. VERY bad luck for me, was that 2/3 of my entire troop fleet went wth them, so any thought of just sending my troop fleet to conquer the disloyal SOBs was not possible when it first happened.
Also, a number of mines, freighters, etc - basically, parts of all aspects of my empire went over with the rebels.
A) Is this normal? And is what worlds and what resources they take - ships, mines, etc, - random? Or is there some expected pattern? Cause when 2/3 of my troop fleet went over to them, it was pure random luck that I had on a warp lane halfway between couple systems. If they were parked where they normally park, right over my homeward, it would have been game over. They could have just invaded with my own troops on my homeward and no way I could fight off that many troops.
*what I call troop fleet is I usually have a heavy assault fleet made up of almost all troop transports and a few defense ships, crammed to the max with troops - for use in any war or skirmish that might pop up.
B) what makes a civil war happen? I figure unhappiness? I did notice right before that some of my colony worlds were unhappy faces - not sure why because I'd barely gotten out of pre-warp, hadn't expanded much or done any war to cause weariness. Maybe I just didn't have enough luxury resources going to those newly colonized worlds yet?
I quickly squelched the traitors, but the worst part was that a number of resources they took instantly when civil war was announced was in my home system - so the ships that stayed loyal that was on defense fleet posture - well, those boys sure did their job because they instantly annihilated all the mines, gas stations, constructors, etc that went over to the rebels.
I could only scream nooooooo in my mind as my own ships shot up all that infrastructure in my home system I had spent good credits building up.
I can't tell yet whether I am amused or annoyed by this, but since it's only happened like once in 14-15 games, I suppose it's not that annoying.