Twice in a row now we haven't been able to complete a 50 wave Onslaught run because of being blocked in different ways. First we couldn't get back to the arena after the 4th boss fight because the portal didnt spawn at all. Second time we couldn't get through the door to the 3rd boss when one of the switches refused to activate when shooting it... that last bug with the switches has been going on ever since Lightfall last year, those have always been buggy and it still has not been fixed... absolutely ridiculous =(