All users on our server expierence same problem: saying something in chat with rather high probability causes lost connection. It's not immediate disconnect, just player stops being able to say anything, or to interact with world. If they were walking, for other players they stop, on map (if said player would look omn map) his marker moves in same direction as before. Locally they still can move in any direction at willbut after disconnect their position will would be old one (obviously, it wasn't updated server-side)

Using chat commands, including /me command doesn't cause disconnect, so that's how we communicate last couple of days:

*Player1 waves "Hello!"
*Player2 nods to Player1
*Plyaer3 asks what is going on.

Now we all sound like hardcore RPers, but it's annoying because little mistake would break connection