Today I pushed the lever to get one swipe of the wipers. They were not in the on position, but continued wiping like there were turned on. The only way to turn the wipers off was to turn off the car. Occasionally when I would turn on the wipers to the first notch for intermittent use, it would do 4 or 5 swipes instead of one. Sometimes it would not stop and if I turned off the wipers they would stop in the middle of the windshield and not at the bottom. Any ideas?