Has anyone experienced or heard a brief but LOUD metal rattling noise at engine start (like two small metal plates rattling against each other)? The service department at my Infiniti dealer stated that he has located a service investigation ticket within Infiniti about "intermittent" metal rattling noise at startup. Trouble is, it is not intermittent in my car - it happens EVERY time but is much louder with a cold start. It drives me bananas that a $45K car makes this rattling noise. It is a brief noise that stops quickly, and does not continue as the engine runs. I have been assured that this is not a mechanical problem and does not affect the integrity and safety when operating of the car. But I have had people ask me if my brand new car is okay when they hear it start? It's embarrassing! Anyone have the same experience?