If the password isn't entered in the allowed time in IRC, a user can be blocked from signing in, and have their name temporarily changed to guest.
You have 30 seconds to identify to your nickname before it is changed.
You failed to identify in time for the nickname
<nickname>You are now known as Guest59588
If that occurs, doing the following can allow attempting to sign in again.
Identify your nick (replacing nick and password of course).
Turn off enforce.
Release your nick from services:
Turn enforce back on