For the last several days, I've noticed problems with Nickserv, on IRC.
Whenever I log in, I have my usual Nickname, Catt.
Within 5 minutes of logging in, Nickserv switches me to a Guest# account.
When I try and go back in to re-register, or identify myself, it Disconnects me from the server.
This happens on both my IRC clients. I use Trillian at home, and ircatwork.com's client.