This same thing happened to me last night. I was in the process of zoning and it just black-screened. Game didn't lock up or anything, as my cursor still moved and I could still hear music, but it's like it just stopped trying to render the new zone.
When I had to hard-close the game and booted it back up, it either failed to load the server list at all, then once it did (3-4 reloads later), it kept giving that "unknown error" as it failed to connect.
A hard reboot and a few failed attempts later, it eventually did reconnect!
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