Fair chance its related to power supply.
I thought my battery was well charged but when the mount seemed to be less than it should be...so
I put on the charger and the problems disappeared.
Have a look at the little light showing that power is on, during the action, if it flickers that means a power problem but if you have a multi meter check with that.
Also I did find a gear once that was not held properly due to the screw somehow working loose.
And it had the thing working and then not.
Hope you figure it out.
alex
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