Rear tailgate plastic roof piece broken

[MajorGeek]

Anyone else experience this? I am assuming the problem is a faulty cut piece.

The top plastic tailgate piece on the roof (that the third brake light sits in and has a piece of rubber to keep water out) came off. I got a new plastic rivet and it came loose. 2 plastic rivets hold the ends down on each end. This plastic piece was hitting the roof nudging it loose with a cracking sound when it happened. So we used a stronger rivet, same thing.

By now, the plastic had bent. We heated it and got it straight, reattached it and used 3m tape to hold it down as a backup. Went through the car wash, no problem. Next day on second use, it busted loose BOTH sides. I am now ordering a replacement piece hoping it was faulty by design and just bad luck. Dont see how it is that we put it on securely with clearance and it still moves to hit the body and snap loose.

If it fails again, I will take it to the dealer, but my experience with this dealer has been to not let them touch the bodywork as they had done poor paint work on my previous H3.