It could be a thermal breaker that goes automatic if the filter is full of fine-dust and the rpm of the motor becomes to high and the heat dissipation will acces the thermo breaker replace dust back AND filter, second there could be if the brushes are become to short the autostop can be activated (you see a little dark pin with micro spring in the brush ) in one of the 2 carbon brushes. if so replace the carbon brushes .
A Switch or cable defect (measure it)
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