I have a '77 280Z S30 never wrecked, but the doors won't close in cold weather without slamming them 3-4 times. They bounce back and the lock mechanism does not catch. In weather over 60 degrees this is never a problem. I have cleaned and lubed both door locks. The locks work without a problem when "tripped" with a screwdriver shaft with the door open when I test them. Is it a problem with the door rubber or the bumper blocks at the bottom of the door opening to the body. I am confused. Any thoughts? Dave