I ended up taking mine in after driving myself nearly mad bolting and unbolting the back of the car, and installing sound deadening on the entire back half. They looked at it under warranty and found that there was something (a harness I think) rattling between the headliner and the sheet metal of the roof, and it was reverberating off the rear hatch. So it sounded like it was coming from the back, but it was actually from the roof. Been about 3 weeks since the fix, no sounds anymore.
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