I've been doing Ouroboros missions, and I started having an issue where I enter the mission, and if not immediately, after only a few moments, it kicks me outside of the mission. I used an auto complete on the mission I was on. Started the next mission and same thing. I enter the mission via the crystal, and once loaded in, it loads me back out. My only thought is I started the missions as a villain, and switched to hero for grouping. I have not switched back. I dunno why it would affect it, not really claiming it does, but it's the only thing I can think of that MIGHT be messing with it.
The missions are the normal missions for being introduced to Ouroboros.
