https://forums.elderscrollsonline.com/en/discussion/551081/thanks-for-killing-dungeon-soloing-i-guess

A similar issue seems to be happening to people in dungeons. I say similar, because it appears that at some point there is a glitch between game and client that sends the player back to a starting point of whatever element of the game they are in. Based on the thread above, there isn’t a clear indication of what triggers it.

Now, I could be wrong and it is two separate issues. Just thought I’d bring the other thread up in case they are caused by a similar problem.