Why? Because in the latest living word event “clockwork chaos”. When the event pop up in a random map, A large group of people will go to that map.
And yea that may lead you to the overflow server the problem is the event does not start in it.
So the race began to reach the map as fast as you can. If not you maybe will wait for a 40 minutes.
All i am saying that this is a great experience and great work .. But the overflow thing looks like a waiting room and it is isolating you from the action .. Hope that will not continue in the future.