This message means that the game has undergone an update, that the existing server you're in is outdated, and you'll rejoin to the game's latest update.

You can expect this to happen during our weekly updates; however, if it happens unexpectedly, it will occur for major bug fixes. We apologise for interrupting your gameplay for a short moment, but it is important to ensure that your and other players' gameplay is not disrupted by bugs in the long term.