What's the point of the doors even existing if they're just going to break. Remove the doors, once encounter starts, close the doors. We should not need to fight a door boss before the actual boss. This is ridiculous that it hasn't been fixed. Raids work like this too, walk into encounter, start encounter, previous room becomes closed off or barriered. So why do we have to deal with that in Onslaught, it clearly isn't needed, and it clearly doesn't work properly. Stop overcomplicating the smallest of activities.