I'll just keep an eye on it for now, it could be this very changeable weather causing it, with it freezing one day and mild the next. At least it's not the headlights, like some owners have had problems with. (I think my car needs a wash as well!)
Seems to be a common issue, unfortunately. Mine's been fine so far (knock on wood!), but I've heard taking it to the service center is the only real fix. They usually replace the whole assembly under warranty.