My nick change every 2 minutes when I am offline.
When the Awaynick every 2 minutes short changes and again immediately afterwards, this is too long or it contains invalid characters. The bouncer tries to put the Nick, QuakeNet does immediately reverse. Two minutes later the same front begins, etc.
Solution of the problem:
Just / setawaynick set a new, shorter Awaynick or an Awaynick without any special characters.