Played with a 3 randoms last night and we made it all the way to the end where you have to destroy the 2 covenant generators. We destroyed them and killed all enemies, but whatever was supposed to trigger the end of the mission never happened. We were all just stuck there. We ran around looking for a missed objective or something, but we had done everything. After about 10 minutes we just dropped out one by one. Kind of frustrating.
It happens, iv had it where the game took 2-3 minutes just to give us the next objective after compleating one.