Hi there,
For me, the game crashes every time without any error code. Only when I do Baal runs and that with the Minions. I think there are several as I read here. Mostly on the third wave when the hydras are spawned. At the moment I can’t do Baal runs like this because the game crashes EVERY TIME and I land on the desktop. It would be nice if you patch, fix or whatever. It’s no fun like that.
There’s something wrong right at that point, between the second and third wave. There are lots of reports of crashes and other odd behavior at that point in the game.
Guess the distracting “blocked toon” animation in the lobby was a higher priority. 
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I created this thread earlier and just like you I suspected the hydras as they are in travincal too. Something with them is bugged.
Same here. My game crashes on Baal waves. Started happening after recent patch. I get light explosion, game frezees and either crashes or freezes my whole Windows and I need to restart my PC.
got same issue when im doing leveling.idk if there planning to fix it. its been there for awhile now.
Was playing single player and after the 3rd wave of baal minions my game became super laggy. I tried restarting my PC and didn’t help. Checked online and still laggy and slow. I find it very odd blizzard isn’t responding to anyone about these issues. If I can’t get mine fixed I want a refund because the game is unplayable now…