had a similar problem on a new one i got (made by Ronak-low quality $45-eeuroparts.com)
i found the contacts to be slightly loose so when the notch on the plastic gear came around to stop the motor the contacts slid back together - ugh - back around again
you can take the cover off and hold the plastic gear in by hand to see if this is the problem
i tightened it up so the gear to contact area wasn't as sloppy - i cant recall exactly what i did to tighten it but i think i put extra washers on the contact mount area to allow more tightening there
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Rich Wiebe
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