We ran the dungeon several times to verify, and it appears most notably with the Golem section, or second wave.
Realizing there is a timer on this, we moved quickly. The first time I went through alone, and had no problems. However, when I guided a friend through, we got stuck on the Golem wave. The sorcerer never came down from the platform. I had a theory, and we play tested it 10 times.
If you kill the golems too quickly, the sorcerer never leaves the platform to engage. We killed all eight fast, he stayed. When we killed a couple and then avoided the others, he came down. It was consistent. five times we were stuck waiting to die with the Blood Moon beast, and five times we kicked Kurak in the face.
Another problem that i noticed was that on one occasion there was severe rubberbanding in the arena section of the dungeon. It was totally impossible to complete the dungeon and the first wave of spiders were floating above ground level which may suggest a misalignment problem with the mesh. I saw this problem before the recent patch so it may or may not still be present.
Looks like it’s already been covered, I’ll leave my notes here for support.
About Kurak’s Lair bugging out: I took zombies, which are slow dps, and the dungeon ran perfectly after failing multiple times with thralls. I think there’s a timer for each section, running the dungeon slower is the trick?
Like when the golems are all quickly killed off, it bugs like it’s waiting for more. When it works there are always a few unused golems.
I’d add we’ve been stuck at the dragon with no boss a few times as well. No explanation for that. The dragon and our thralls dont take damage.
I find that if I just wait in one spot for the golems to come to me, then finish them one at a time, the sorc always comes down, while there are still a few golems left to wake up. Then I just avoid the sorc while I get the last golems.