They happen to every single cv axle ever created. Just a tip: If you have an issue that directly relates to a thread that you have already started, do not start a new thread. It really mucks things up sometimes.
i've driven front clicking CV's for 50,000+ miles before when i lived in maryland. not a big deal. one of my DD's has been doing it for a year or so now...again, not worried about it. there's no impending issue if it's an OEM Subaru axle, they are extremely robust.