I'm not sure if this was ever brought up or if anyone else experienced this, but the other day, I noticed that there was a loose cap nut on the interior of the door panel of the passenger side front door. Both cap nuts were loose and same was true for the rear passenger door! Not sure if these were just overlooked on my particular vehicle but good thing they didn't fall off completely. Attached a photo for reference to help locate and show the cap nut. You can see in the photo that the base of the cap nut is not flush against the surface of the door panel. (Note: this particular view is of the front bottom of the door near the door hinge. Just thought to share in case anyone else has this same problem.