Is anyone else experiencing this? It is actually the roof panel bouncing on the frame of the cubby hole frame above the bed. just climb up on the bed and use your hand to tap and you will hear it bounce. I am going to use some construction adhesive to seal it. Barring that not working I will drill through the ceiling panel of the cubby hole and through the metal frame and use some 1-5/8" drywall screws to secure it. Also the panel on the ceiling of the cubby holes kind of rattles too but one rattle at a time.
Here is a pic of the behind. Look close and you can see I have a blue pen sticking through. Now granted I had to lift the ceiling panel to put the pen in there but it just goes to show it is not fastened and any bumps will make it rattle.
As you can see the ceiling panel just lays on that metal frame.