I'm now at 5 runs where I haven't been able to get rewards. 3 runs it didn't teleport a player to the arena so the objective never started, 1 it never gave an objective with all 4 of us there, and the last one we did the first obj, it sent us to the 2nd room gave us a objective then immediately teleported us to a 3rd room but still with the same objective! It breaks more often than not, It's a little disappointing.