2 of my 3 or 4 runs in COB resulted in the boss never spawning, and earlier, even had to back out of the Nether because one of the taken captains that you need to stand in those wells to damage, teleported inside the barrier protecting one of the clusters. It's so much fun having my time wasted, right after drops in both activities are improved and actually worth the time. Edit: and yet another COB run in which the boss didn't spawn. Almost every run today had this problem. Again, funny how when the activity becomes worth grinding, doing so literally becomes impossible for 50-75% of the matches. If this should be expected, then it's only fair the rewards should reflect that on the off chance the game doesn't bug out and we're actually allowed to reach the chest. Edit 2: Happened again right after the first edit, except the boss despawned almost immediately and we got locked again 10 or 11 bosses into the activity. The other 2 guys said it was their 2nd and 4th times it happened today. For me, all but 1 or 2 of my runs today had this problem, one of which was a normal run. I get that act 3 just started, but this is definitely NOT how you start it off, the game shouldn't be so buggy that players should expect it to become unplayable nor so buggy players should feel entitled to getting loot proportionate to what they should've gotten like 6 or 7 times now in my case at least. Screw that. I have better things to do with my time than waste it getting cheated out of what I earned multiple times in a row, and we both know you won't do anything more than say "we have identified an issue that we'll fix by the end of the month, apologies to any affected players". Good thing I bought First Berserker Khazan yesterday.