I had this problem as i was using the motor to tighten it by holding the chuck and spinning the motor, when I started tightening while it was not running it's fine and never comes undone.
VinceNow there's a thing. I will try that hifly. Thanks hifly and all.
I have the same problem with the Makita,and have put it down to the sudden braking action if the trigger is released quickly.
Have noticed if I let the motor slow down gradually,the chuck stays tight.
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