Huck
FRF Addict
Mine was every morning. The plastic sheet that is held to actual door with glue was falling off and laying against the door panel when it was cold. The cold caused the glue not to stick. But as soon as it got warm it was nice and tacky again and the rattle would go away. I removed the glue and applied some 3m double sided tape and then put foam on the plastic sheet to keep it from touching the panel. No rattles since.
The rattle is actually the door lock indicator. It's rattled on the last 3 f-150 I have had. Some surgical tubing does the trick, no more rattle