In the final(?) mission for Heart of Thorns, “Hearts and Minds”, I was removed from the instance during the final boss fight.
I had just sealed the second rift while fighting Mord, and a warning popped up saying that a large attack was coming and that I needed to get in the air to avoid it. I hit an air jet and started gliding, and then I got caught in something (another updraft? part of an attack?) and it rocketed me straight up in the air until I hit a loading screen. After the screen, I found myself unceremoniously dumped back in the whirlpool area next to the mission start marker. I lost all of my progress in the mission, which wasn’t easy to solo as far as I had. I honestly don’t even know if I want to log back in now.