I only had my IS-D for 10 days or so.... Very satisfying car so far. However, as I live in LA and drive locally often, I have noticed that I already have a strange symphony of rattles coming from several directions. This only occurs over bad roads, but seriously, I only have 300mi on the clock... Is this something I will have to deal with regularly? How helpful are the dealers when it comes to rattles? I hear rattles mostly from the back, but also from the sunroof direction and the pillars. Please help!