I believe there's a update for this from the dealer I was in front of oil change in the last couple weeks and they did a software update that was causing certain people's trucks to go dead. They did it to mine but I've never had this Phantom radio issue.
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I started a post about this a couple years ago. I think the door chime comes form the radio unit and it gets confused when the doors are opened. It sometimes only does after I leave the door open for a little while. I just ignore it because it doesn't affect the drivability of the truck. I'm not letting the dealership touch the truck for something this minor and come away with a larger problem.