Sounds like it may be the contacts sticking. When you turn off the wipers mid way through the cycle, they don't stop, but rather get to the bottom and park. That's the contacts (or points) that keep power to the motor until it reaches bottom, where they SHOULD open up and stop. If I remember correctly, (and I'm getting old), you should be able to see these without pulling the entire motor out.
Good luck.
Stu
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