The side door on my 2016 Equinox has become more and more difficult to close. At the end of last year's burning season I had to push quite hard to close the door. Today, before starting to burn for this season, I examined and scraped the hinge area and along the edge of the door panel. The door handle and locking latch seem clear but the door is still very difficult to close. There does not seem to be any crusty build-up in the closure area. Any ideas??