We are currently investigating connection issues some players are having on the European megaservers. We will update as new information becomes available.
I suggest shutting down your PC and starting it again, first and foremost. Do not use the "restart" function as it does not completely shut down the PC. A friend kept crashign with a previous update, balked that a restarting would work and was amazed it did.
If that does not solve run a repair and do a shutdown and startup again.
Good luck.
Most of us have been playing today without significant issues. Granted, my client did crash for the first time in months, but that has been the only issue.