My wife and I both experienced this today. We lose connection when playing, then when we try to log back into the character we were playing, it displays, "Connection to the server is lost" with quit button. When we click the 'quit' button, the screen goes blank and we can't alt-tab out.
This problem only exists for the character that crashed mid-game. We can log into other characters just fine. It is as though the character files were corrupted when the crash happened.
The problem for us now is that we are locked out of those characters.
Starting playing another character and the same thing happened. Character just stopped. I had access to UI and chat window updated, but no character control. After a minute or two, the "Connection to the server is lost" with quit button appeared.
I'm afraid now to log into any other characters in fear that I will corrupt all my mains.