that usually happens when the windscreen is too dry on a lot of cars. if it's not raining hard or in snow the up stroke clears all the water off the windscreen leaving it dry for the down stroke so the friction between the glass and the soft rubber causes it to jump.
I agree with Jonny. When the autowiper activates, it's fine when the screen is drenched but sometimes it comes on when the screen is only a little wet and judders like any wipers do on a screen which is too dry.
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