My 2020 CX9 developed a rattle shortly after purchased (1/2020). It happens intermediately. (But usually ever day) Had it back to dealer sever time and naturally it would not occur. It occurs while driving on roads which may cause slight vibrations. You don't need to go over any hard bumps for it to start. If I press hard on the passenger side air vent it seems to go away. When I release the pressure it comes back. To me it is either the vent or something it the dash surrounding the vent. Anyone have any ideas? Please help, this is very annoying in a vehicle that should have a quiet interior.