Hi wipers on my mk3 vr. Started a while ago after using them a while on slow speed they would judder down the screen as if the screen was dry. Regularly you could only use them on fast wipe at first then switch to slow when they would eventually stop. Go back to fast they would work then go to intermittant and they would work for a while then stop. Lately they only work on fast. Then it got worse and you have to turn on the wipers to fast and give the arms a nudge by hand to start them off. They then will work all the time but if you turn them off and wait a while they wont restart unless you