While the cylinder was removed, I applied lubricant inside the lock and then focused on lubricating the rotating part of the cylinder in the middle. I would avoid putting lubricant inside the cylinder itself, as the key would become greasy 
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Thanks, but lubcricating the inside of the cylinder key entrance would be not too bad as well, because I think the key doesnāt go in very easily.
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Iām having the same problem and asked for a return label before Iā will be stuck with a defective lock.
Iāve had 4 generations of Nukiās on my door and I was really exited to get this one and really disappointed. I was also really disappointed with the noise and got lots of negative comments about it. I have used the gen. 4 pro for awhile and was really happy with it including the loudness. Really too bad!
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As promised here is the first Beta for the Smart Lock Ultra, which also addresses problems with the unlatch behaviour.
If you have such problems, please sign up for beta and report your findings directly in the beta topic:
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