The wipers go too far across the windshield past the glass and then go completely back, slamming under the hood lip as if in the hidden "off position". It doesn't matter if they are on continuous or intermittent. Sometimes if the rain stops or just a light mist, they will make a normal stroke or two. I don't know if there is a computer chip that controls the stroke. It makes a terrible noise as it slams back down with each swipe and I'm figuring it might damage the whole mechanism .