There may be more than one reason. The most likely is the rise of the window-lift unit. In order to eliminate the rattling, it is necessary to remove the door cladding and oxidate the windows of the window-lifts with a madlin or a bilateral tape, and then install it back to the landing site.
Another likely cause is the bolt locking bolt. It can also creak the door lock at the door. It is necessary to loosing the bolt and to spring it and the door lubrication.
