He resets if you try to drag him into and side room or the room you zone in to. He will sometimes reset before he even gets to the doorway. Have to keep him in the hallway.
I think we figured out what was happening. Watching one of the videos for the mission, the commentator stated that if Fade is snared, it can cause pathing issues when you move him and cause him to reset. One of our people was using snare and will take it off their hotbar the next time we go in to see if that is what was causing it. We kept Fade in the hallway the entire time, so pulling him into a door wasn't an issue.
We went from West hallway - Door - rinse and repeat. The only time it bugged on us was when the rogue in group used a blind. When we stopped that it seemed to path correctly, but it might have been tank moving better, hard to tell. Maybe snares might effect it too, we stopped using them as well to make sure Fade followed close by. We generally moved to the middle area of the long hallway too. Honestly you could probably move even closer to the door and that might help prevent the bug.