Hi everyone ... I bought a new 2013 OB Premium in late September and now when I am idling, I hear a strange noise from the roof towards the rear or the vehicle. It sounds almost like a drop of water hitting (you know that thumping sound) the roof. It happens regardless of if I am in park or drive. Has anyone experienced this? I want to take it to the dealership but also don't want to look like I am overreacting.