I was just in the Tomb of the Beguiler. I cleared basically the whole instance, so that all that was left was the fight against Ngozi the Beguiler. I was in the room immediately before his, and had just killed the two mobs there. In order to refill my health, I backtracked to the previous room to grab two wisps. When I returned to the room where I had just been, instead of putting me in the proper room, it took me outside of the instance entirely.
This also happened to me about a month ago on a different character. It was about the same circumstances, with everything except Ngozi the Beguiler the two mobs with him done. I don't recall which way I went through which door, but again, it was going through one of the doors at the very end of the instance that caused the whole thing to reset.
I didn't post about it at the time, because I figured it might have been a server hiccup or some odd fluke. For exactly the same thing to happen twice in the same spot is no fluke. I haven't seen this occur with any other instances, or even in a different place within the same instance. There's a bug somewhere that causes this.
This is by far the worst bug I've seen in my time in the game, and pretty close to game-breaking. To spend more than two hours to get a shot at a boss, and then have the whole thing reset before I get to try the boss, is quite frustrating.
The bug might be peculiar to the particular doors I went through (between the third and fourth pairs of non-boss mobs just outside of Ngozi's room), but that would take a really weird coding glitch. It might instead be caused by going through the same door twice in a row in a short period of time. Normally that would be rather strange, but right outside Ngozi's chamber, going out a door, grabbing wisps, and then going back in the door is quite a natural and obvious thing to do given the way the room is set up.
