We spend about an hour in the Mistlands, clear some mobs, set up a portal near a dungeon, go into the dungeon and clear it though get pretty beat up doing so. Just about ready to head out and hit the portal and the game crashes.

Come back, my partner, the host, is safe back at base, i am still in the dungeon, still beat up. The portal and everything else we had done for 45 mins or so was gone. The dungeon was full. I was dead.