I was doing a ET run. I got back to town since I ran out of supplies and when I got back I got a message saying that there were some error(don't remember the exact wording) with the memorial dungeon and I got promptly disconnected. When I logged back on my memorial dungeon is gone and can't enter ET anymore.
Edit: the message was: A system error has occurred in the memorial dungeon. Please relog in to the game to continue playing.
Edited by Qani, 31 March 2018 - 04:49 AM.