My Nuki Pro just auto updated to the new 5.6.2 today. I’ll give it a few days and let you know how it goes.
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So I have no major issue with this firmware version. That said I have noticed something strange. The lock is fully functional so it’s not a major issue.
I have my Nuki Pro set to insane for locking speed. and it is also set to use the shortest locking path in the optimisation settings. it works well and delivers a very short sharp opening a locking operation that is loud but for a split second. I have noticed that sometimes when the lock is doing an auto lock operation the locking speed seems to fall to gentle and is much quieter and takes a lot longer to complete the locking operation. It’s not common and only happens a few times randomly but it’s weird. The lock completes the locking acton with no issue really it’s just done slowly. when I come back home it’s back to insane speed when the door unlocks and then auto locks. I don’t get any indication for any issues in the logs as the locking operations complete successfully.
I do use gentle speed when night mode is active. This was not the issue as it was the middle of the day and night mode is activated on a schedule so I do not turn it on manually.
You may remember I had some issues with auto lock not completing and bouncing back to the unlocked position so for a while I stopped using the shortest locking path and reverted back to normal. Since I started using the beta firmware back on 5.5.5 I started to use the shortest path again as that issue was down to the door sensor magnet not being aligned properly. If I’m honest I’m not too sure how long this issue has existed but I only just noticed it so I assume it’s a new issue and reporting it here on this thread.
Well it’s just done it again there when I came home. I repeated a test open and close using the manual button. it opens fine. when it’s doing the locking action there is a motor noise but the metal outer is not turning. after a few seconds it finally turns and the locking action completes. Very strange indeed I don’t think its gentle mode its something else. I will lubricate the lock tonight just in case but it’s been fine for months.
EDIT: the battery is at 66% do you think that could have something to do with it?
EDIT 2: 29/10/2025 - Lubricated the key slot and the bolt with graphite powder and the lock is working smoothly. I switched from significantly reduced locking distance to the reduced locking distance option within the optimise locking setting and it made little difference. It still takes a few seconds of strained motor noise before the outer knob starts to turn. it appears the motor is struggling to turn the key all of a sudden. I will charge the battery incase that is the issue.
EDIT 3: 29/10/2025 - Battery is now at 100% and the issue persists. I can mitigate the issue by setting the locking speed to standard and the optimise setting is set to normal (default) the lock is currently appearing to function normally but only when on these specific settings. If I use my previous settings the locking motor still takes several seconds to engage. I will leave these settings (standard & normal) and test over the next few days. If it happens again I will attempt to video it.
EDIT 4: This is a video of the issue. The link is valid until the 07/11/2025
Attached a yellow post it strip so you can see the knob turning. Please turn on sound.
Initial post has been updated with the release notes of the new Beta 5.6.3.
A new Beta bringing Matter related stability improvements after the migration to Matter 1.4.1.
We highly appreciate the feedback provided from all out Beta testers and are eager to improve our products to achieve the best in class user experience. Please install this newest version and provide feedback in this channel in order to further shape the experience.
Thanks for your support 
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I am observing the behavior of my NUKI GO for several days, one time it opens the trap at first attempt and then not again. As mentioned the motor speed variies claerly audible and opens the trap only when high enough.
The new update to beta 5.6.3 did not change this behavior.
I was hoping the motor behaviour would have reverted back to its previous state in the new beta of 5.6.3 but it seems so much worse. I have opened a support ticket as it getting difficult to listen to the motor noise for an extended period of time. It was just a second or 2 at the start but now it’s regularly between 5-10 seconds of motor noise before it engages and locks the door. I had to video the calibration. process for support and it was horrendous.
This is the calibration video link. Shame you can’t post video here. The link is valid until 16/11/2025. It was recorded from the camera on my MacBook as I could not record video and use the Nuki app on my iPhone at the same time. The quality is poor but I attached a post-it again so you can still see the issue.
https://drop.ui.com/bd34455e-5330-415c-a2d1-81dd24af1a0d
Here’s hoping the motor behaviour can be returned to its previous behaviour in 5.6.0 or 5.5.9 as this worked much better for me. 
EDIT: Support has the device logs on ticket 694549 if that will help the developers.
Can you verify whether the yellow gear that connects the Nuki to the lock cylinder shaft is indeed intact? @JBUK72
Hi @mreal
This is a Nuki Pro not a Nuki Ultra Its a key slot and the Nuki device is intact, its not dropped to the floor or been hit against a wall as the door does not open towards a wall so it’s not damaged in any way. It all happened very suddenly, I’m still thinking it’s firmware related only because it started after 5.6.2 beta was installed.
Hopefully support will have more of an idea what’s happening when they get a chance to review the additional info I sent them.
On the video(s) it looks like the clutch is not engaging properly. i.e. the motor turns, but the key in the lock does not move.
Try setting it to a higher speed (e.g. standard) and check if the problem continues to occur.
Hi @Juergen
I was using the lock on the insane speed and I dropped it to standard to see if that would make a difference. It did help it for like 2 actions then it started again. When I say 2 actions I mean 1 unlock and 1 lock action. The funny thing is, the outer knob is moving freely while the motor noise is going on. I can turn the knob and lock the door manually without the motor engaging. Once locked the motor noise stops. Very weird but I rubbed against it one time and noticed the outer knob moved freely just like it would when the lock is manually operated. I have only attempted this once as the motor was taking longer than 20 seconds to engage but I don’t want to do it again as I worry this will break something.
Quick thought… you mention the clutch, can this be firmware related? Like I said earlier the behaviour started very suddenly after 5.6.2 was installed. Just wondering. Thanks for all the help from you guys and the support team.
In theory yes, because the startup behavior of the motor is influenced by parameters set in firmware. But there was no change of any such parameters from 5.6.1 to 5.6.2 to 5.6.3. Furthermore your videos point towards a mechanical issues. Therefore please follow up with support to get your problem sorted.
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Hi @Juergen
Thanks for the reply, the support ticket has been progressed to another team so I will wait for them to advise of next steps. Thanks anyway for your comments they did help me understand the issue.
Was something changed regarding the latch problem. In an early update the door would unlock and the motor blocked and did not release the latch (Nuki Ultra Pro had to be unmount). This lead to a broken yellow gear after some time. Now with the new update it started again by not releasing the latch.
Thank you for your message. Please stick to the topic of this thread regarding Beta phase 5.6.x after Public Release 5.5.10.
Consider joining our Beta program to receive the last updates and improvements and provide us with feedback. More info: How to become a Nuki Smart Lock Beta tester
Please stay tuned to the upcoming improvements in this Beta phase 5.6.x
Initial post has been updated with the release notes of the new Beta 5.6.4.
This release focus on ensuring a smoother and more reliable operation, particularly for latch-pulling functionality on the Smart Lock Ultra and Pro. These enhancements are designed to improve consistency in performance across different door setups, further strengthening overall product reliability.
We highly appreciate your feedback provided from all our Beta testers and are eager to improve our products to achieve the best in class user experience. Please try out this new version and provide feedback in this channel in order to further shape the experience.
Thank you all for your support
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Just installed, sounds good.