Easy fix, but you need to know what to do...
Open mechbox
Look near the first gear/bevel gear (the one next to the motor)
There is a small lever with a spring on it. It should be placed so that the spring apply tension on the lever against the bevel gear.
Close mechbox carefully
Enjoy! Should solve everything.
If you still can't make it or if you are not sure what to move, get it to a gun doc.
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