Noise in door.

If anyone ever visits this forum anymore can you answer a question for me. I have a 2003 Element ex. Anytime I drive over a pothole or any other dip in the road I hear a clunk from where the driver side doors meet. I've taken it to the dealer several times but since the roads where I take it to are much better than my roads at home I can never re-create the noise for them. Anyone know what could be causing this?

take the door off and check it out