So I have a 2018 PacHy Limited I bought a month ago. It has a rattle back around the 3rd row and my kids said it sounded like it came from the ceiling. After much testing, I have become fairly sure it’s the 3rd row sun-roof. When I open the shade of the sun-roof shade back there, the rattle disappears immediately, but when I close it, it starts rattling immediately again. Ironically, I’ve found that if the shade is closed for a while while the sun is directly overhead, the rattle will eventually stop. Part of me wonders if the something in the shade is heating up and expanding in the sun and causing the rattle to go away after a while.