We do work to make such transfers to another server unnoticeable for players. We also try to notify about maintenances that may affect anybody.
I don't see any notifications or alerts. This means that there wasn't any unplanned maintenance tonight, neither issues. In some cases there may be short-term login issues whithin transfers to another server still. Sorry for that.
We apologize for the inconveniences.
Also thank you for this report, sometimes it allows us to detect an issue at a very beginning.