has anybody ever experienced that their smart lock opened the door and kept on turning - making loud sounds like a machine-gun. 
Hi,
never heard something like that from our Lock. I assume that it is an mechanical issue of the motor or gear - like something is broken inside. I would contact the support team directly.
Cheers
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Please contact our support via the Nuki App (Menu > Help > Contact Customer Support) for help. This forum is focused on developer related issues and can’t really help with your mechanical problem.