Open up the door and try to move it up and down. If there's a movement the door is loose. If that's the case, tighten the bolts on the hinges and then drive it and check for air leaks around the seal as the loose door means that the initial alignment is has been disturbed. Check the gaps around the door on the outside while it is closed to make sure they're in uniform width. If the door is not loose, try silicone lubricant on the rubber seals. Hope this helps.