So the pre 70 cars have a push button style exterior door opener. The other day I went out for a drive to the store and when I got back to the car, I went to open the drivers door & the button did not actuate the mechanism. I was able to reach in and pull the inside handle and open the door. Getting home, I was able to open from outside. this appears to be an intermittent problem but it seems to be happening more often. Is there an adjustment or cleaning that I can do to rectify this problem.