While driving through a parking lot, I heard a noise coming from the rear seating area. I have heard this noise before and always thought it was the seatbelt mechanism making the noise. Today, I opened the rear passenger's side door, started to shut the door, and stopped. The momentum caused the noise to occur. I swung the door back and forth and it continued to make the noise. It sounded like the sun shade was loose inside the door and banging around, or possibly a wire harness. It is definitely coming from inside the door. The sun shade works fine. I opened the rear driver's side door, swung it back and forth, but it did not make any noise. Going to take it to Ford since it is under warranty. Anyone else have this issue? Thanks!