Nuki Opener noise

Since last two weeks Nuki Opener started to produce some strange noise. I’ve noticed what that noise take place 3-4 seconds before the front door closes. So if I will set “door open duration” for 30 seconds, the noise starts right at 30th second. I’ve recorded video of that noise. Here is the link for the video:
What should I try to do?

And I forgot to mention that noise only appears if I open the front door via mobile application on my iPhone. If I directly push the button on the Nuki that noise won’t appear.

I have the same strange noise. Maybe are the speakers broken?
Should we return that damaged openers?

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