Not sure if it's applicable......because I drive a ROADSTER.......the roaster stays in the kitchen.

I have a little "buzzing" when the stereo is way up....I think it's coming from the inner door skins.

The trunk issues that I have heard of are the trunk not unlocking....just the opposite of your problem. It might be cured the same way though.....try locking the car while you're pushing down on the trunk. see if that makes a difference.