Both doors on my 2006 EX-L van won't close on their own. They get about 1/2 - 1/3 of the way closed, makes a beeping sound, and opens back up. Sometimes the doors seem to be chugging closed, not a fluid motion at all. To close the doors, they have to be forced from behind...a complete pain in the butt. Any suggestions before I bring it to the dealership?