Same issue here. I can't even finish an expedition run without it freezing then disconnecting me from the server! I'm literally throwing away gold making these expeditions.

Same thing here,..

I get "Error 0".

  Have requested a refund through my credit card already for this level of unplayability.

same problem here, i cannot play dungeon because the game disconect me avery 20-30min :(

also experienced this since the patch 1.0.4, cant finish any expedition.
fixed mine by removing my unique belt, the one with "100% chance to apply mark of impurity on hit". figured that item was making me dIsconnect/freeze when i use bleeding edge on large group of enemies.
try removing some items/passives with complicated on hit effects maybe it will work

I also got this stupid bug.
But it only happens if I am the session host (or playing online alone). Me and everyone else get a disconnect back to main menu.
It definitely happens if you apply Mark of Impurity. But sadly this skill is the main part of my build...