I would check the alignment of the window to make sure that they are not coming apart. many had their hatch damaged due to the adhesive that holds the hatch window failing...
I had the same issue and i took it to the dealer and come to find out the noise was caused by a loose wire in the rear windshield wiper motor. The dealer took it apart and placed foam around the wire and the noise has gone away. Now i notice a rattle on the passenger side headrest.