I and several other players I spoke to have crashed multiple times when trying to teleport to the Kynesgrove (festival) wayshrine today while playing the festival quests. I've been disconnected 5 times, I believe.
If I don't try to port to Kynesgrove, I stay connected. (But obviously I can't do the festival quests.) I crash within a minute or so after the Eastmarch loading screen appears. The client says "Unable to connect to game server" but my internet connection is great.