I have two issues with my windscreen wipers. The first if I have them on Continuous and then get out and lock the car, when I get back in the wipers dont start up when I start the car. I then push wiper lever up and they go off like a mad thing at high speed and I then have to move lever back to the original position, Is this normal? also passenger side wiper occasionally seems to sound like it is hitting window pillar under heavy rain but not on every wipe, just now and again