Every time on every faction once i get to about 60% of the campaign map my empire gets out of control.

Everyone is rebelling and all the eliminated teams are reappearing.
In one turn 30+ provinces rebelled and 5 factions reappeared all on my territory. Why so many!

I always keep about 1000+ troops in the territors to try and stop them, but it doesnt work.

Even when i have had the province since the start, it still rebels. WHY!!