The passenger door on my new 2011 Sonata Limited sounds really hollow/tinny when you close it. Even the exterior sheet metal vibrates and moves when you close the door. All the other doors sound really solid when closed. Anyone else notice this problem. My sister had a rental last week (GLS) and the passenger door had the same "hollow" tinny sound. I wonder if Hyundai left out a support beam or sound baffle... Thank for any input.