Advanced Duplicator breaks over time sometimes.
But I've never seen the problem you describe. Usually when it breaks for me, it never fully copies, and the 'status' percent complete window stays up until I rejoin.
Rejoining the server doesn't fix it for me except to remove the status. A map restart usually fixes it.
Team Ulysses didn't write adv. dupe.
I'll check the server later (maybe) and see if adv. dupe isn't working.