When I turn on the wiper for the first time it will wipe all the way to the passenger side, and then stop at the base of the windshield for one to two seconds before continuing back to the driver's side. It only does this after the wiper hasn't been used for more than a day. If I stop the car and go back to use the wipers a few hours later it doesn't stop during the first wipe. The wiper operation is otherwise smooth and quiet. Any ideas as to why it does this?

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1989 300CE