Earlier I did a quick Minor Arkbreak. I was with one clanmate (he planted the battery after just having completed the story) and there were a few other randoms with us.

We went inside, and just about cleared it out, and after shooting one of the last Volge Drones in the room I randomly get thrown out of the Arkbreak. No disconnect or anything like that. I'm just finishing shooting this drone and all of the sudden I get a loading screen. Didn't do anything like leave a group either, one second I'm finishing off an enemy, the next second I'm randomly cut out.

I should note that when I got kicked outside there was a minor Arkfall just started out in the spot the Arkbreak was when I went into it. Maybe the Arkfall spawning there caused the issue?