My first bug was an instant death of my character when entering Lightless Arbor level 2, right after the loading screen.
Then a “Lost Connection” in a later try with a new key, but this time in level 3.
And then again in Soulfire Bastion, a funny “Lost Connection”.
I don’t dare to run any dungeons because it costs me keys again and again and I don’t have the time to farm keys for hours on end.
It would be great if the key only disappeared when you finish the dungeon. Be it through the boss kill or when you teleport out via portal, and not right at the beginning when you unlock the door.
That way you would at least still have your key if you have a disconnect.