When a lot of data gets processed at once, I'll get a a bunch of messages asking to close the application. This makes it impossible to play the game, because as soon as I close the message I wont be able to do anything before being asked again. This makes Playing on servers really frustrating, because I'll get killed in the game while I'm closing the message. It's not the only way it can occur, but one way to replicate it is to join a friend's world, have them crash, and then try and join the world. It doesn't happen every time, but repeat that process a bit and then you'll see the message. I'll show a picture of it below.