Game crash during trial of chaos

There seem to be 80% risk of the game crashing before getting through Trial of Chaos and killing Trialmaster.

I was at round 6 and then it crashed and threw me out to login screen. When I got back, then I was at the Temple Offering with no loot and no Inscribed Ultimatum.

I failed 2 because of the game being so unstable and it didnt fail because of death. I was about to pick something before entering the next room.

After those 2, I got all the way to the end and killed the Trialmaster. I was so afraid of it crashing as soon as I had payed to enter the Trialmaster room, just as an extra F you from the game.

The loot was terrible as always but at least it didnt crash.. Until the next round where it completely closed the game after 3 or 4 rooms.

I don't understand how anyone are farming this. Is there some specific server that isn't completely unstable?

I have to stick to maps until this becomes stable. Maybe focus on fixing the game before adding anything new that will just introduce more crashes?