Had a really weird WTF moment.
When I got out of my truck tonight and closed the door and then locked them, about 30 seconds later I heard a boom coming from the inside. It sounded like a large amount of air being realeased. I did some further testing and the closing/opening of the door had nothing to do it. If I unlocked the door with the remote and then locked them, about 30 seconds would go by and it would do it again. I popped the hood and it is very obvious that the noice is coming from the interior. I sat in the truck and it appears to be coming from the driver's side door speaker/pedal area.
Any ideas? I cannot get the problem to recreate. I have never even heard this sound before or heard of anything like this before.