Hasn't happened to me but a couple of folks with Challengers found the splined gear that connects the wiper arm to the motor was not the correct size and they had the issue of the wipers not functioning or just flopping around.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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