Nuki does not open the door

I always have the problem that Nuki does not manage to open my lock. You can hear from the outside how it opens, stops and tries again to unlock. The second attempt does not work either. If this is the case, the door can no longer be opened via the Bridge(API) for a short time. This is extremely annoying and leads to the fact that lately I ALWAYS take a key with me, because I just do not trust the lock anymore.
I have already recalibrated it three times. The lock is brand new, greased and smooth running. Does anyone have any ideas what else I could try?

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