I know there are many threads on interior noises coming from front seats, rear doors, and sunroof, but as far as I can tell we are experiencing a different noise. Dealer has confirmed noise but is unable to pinpoint the source during test drives. Wondering if anyone else has experienced this? Sometimes its constant the entire drive, other times it only happens on rough roads and over bumps. It's driving us crazy, sounds like someone clicking a retractable pen non-stop.