So it starts raining and I turn on my wipers. Whack, whack... the wipers are now smacking the windshield gasket. It quit raining. A week later it's a light drizzle so I punch the "pulse" button. Worked as expected. Tried the on button and again, working fine. Turned off the wipers and back on. Whack, whack! So is the fix for this a new motor or is there some kind of...