Same problem here. Matter works well for a few hours and then it no longer connects to Nuki. Anyway back to WiFi.
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terribleā¦ have all new stuff here ass gtbe-9 wifi 7 iot network 2 gig fiber
frondoor nki 4.0 with matter very time lose connection crazy ā¦battery in and ouut
so sick of this
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The issue with losing the Matter connection is fixed for me with version 4.5.1.
Normally I will lose the connection after 3-6 days in the past.
Device connected mit HA using MQTT AND Apple HomePod mini.
WiFi access is very close, with a mesh network misc of 2.4 and 5 ghz.
Defaults settings in the lock aswell.
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Since the beginning of November, my SL4Pro shows 80% battery,after reboots for about 2 minutes, then it shows 72% and then 80% again. Battery report didnāt work, app hung up, since a few days the option has completely disappeared. I use the Nuki batteries.
I hope, that my half year old Nuki one day will work without issues!
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Initial post has been updated with the release notes of the new Beta 4.5.2
This Beta implements several improvements and bug fixes, improving not only the overall system stability but specifically the stability and availability of the Thread connection. If you experiencing any issues related to Matter or Thread please install this Beta and report your findings in this channel.
Any feedback is highly appreciated. 
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Since update to 4.5.2 two hours ago, I donāt have connection via Thread. No remote. Nothing! New start without success.
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Also: with the 4.5.2 beta-firmware, the āstatusā of the Nuki lock in the ā1stā, small Widget is not automatically updated, one still has to press the āupdate arrowā on the Widget for this which makes it not very intuitive.
So I tested the Thread improvements in 4.5.2 by re-enabling remote access via Thread and the connection was stable for two days. On the third day, the lock went offline again. So back to WiFi, I guess.
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After updating to iOS 18.2 my Nuki lock 4.0 Pro became āunreachableā in the Apple Home app. I did the āold trickā: take out the battery pack and place it back after 30 seconds on which the Nuki lock āreconnectedā. Once again, I suggest Nuki to mimic this āroutineā into the firmware to run daily at 04:30 hours (and again: I am kidding!)
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Can you please detail what āwent offlineā means?
Was it still reachable via Matter?
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How long was it offline before you took out the batteries?
Reconnects are handled by the official Matter/Thread stack. In the current beta we are monitoring this process and are restarting the system under certain circumstances. But it has to be offline for some time in order for this to happen (>30min).
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At that moment not really knowing why but I timed it and wrote it down: one hour and 12 minutes after all my devices (also my Apple TV 4K 128 and 2 HomePods) were updated, I did the āNuki battery off/on-routineā. Then the reconnected within seconds in the Apple Home app.
It was unreachable in the Nuki app and listed as āofflineā in Home Assistantās Matter server overview. Notably, only one of two locks went offline. Both were configured identically to use Matter over Thread.
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I am trying to understand what you exactly mean with ārestarting the systemā: which āsystem? And how does that correlate to the āofficial Matter/Thread stackā? What is that, is that an automated ānotarisation agentā beyond the influence of Nuki? In the published manuals and YouTube videoās from Nuki there is no wording at all about āstacksā that can be offline causing the āconnectionā not to work. It is even worse: the wording is that āinstallationā is āvery easyā and āfastā due to which the ones, including me, who take the trouble to read this website get the impression that the āfaultā in on the user-side, a narrative that also the Nuki HelpDesk suggests when one contacts them. It seems that there is a lot of āmagicā done ābehind the scenesā but how are āweā supposed to be aware of that?
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This is tech language and only used here in the developer forum. No normal consumer needs to care about it. Btw. you can read here what a āstackā is in the context of the Smart Locks firmware.
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Same problem here (Nuki 4.0)
After updating to iOS 18.2 my Nuki lock 4.0 became āunreachableā in the Apple Home app. I did the āold trickā: take out the battery pack and place it back after 30 seconds but still unreachable.
I removed the Nuki 4.0 lock from Apple Home and Nuki App & disabled Matter. Added the Nuki Lock again with Matter Code to the Nuki App and Apple Home (Matter and remote access enabled). Was working again, but next day āunreachableā again.
There is nothing i can do, except to drive to my parents to get the physical keys to open my door.
There is something wrong with Nuki, because my other 30 Matter/Thread devices are online and working, even my 4 Homepods and Apple Home (with Thread) is working fine!
Apple Home shows Nuki Lock Firmware 4.1.0 even after reconnecting and in Nuki App the firmware is latest (4.5.2). There seems to be a firmware mismatch between Nuki 4.0 and Apple Home, maybe this is a root cause?
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Update:
It seems to be fixed by updating the Homepods and AppleTV to 18.2 too.
So if you update to iOS18.2 then update Homepods (in Apple Home settings) and other Matter Smart Hubs too.
Today Nuki 4.0 works normal again.
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I have the same with the firmware version of my Nuki 4.0 Pro: it shows version 4.1.0 in the Apple Home app but version 4.5.2 is installed and shown in the Nuki app.
I have the same with the firmware version of my Nuki Ultra. Shows version 1.2.0 in the Apple Home app but version 5.0.26 is installed and shown in the Nuki app.
This is normal. The FW revision shown in Matter just relates to the revision of the Matter portion/stack of the firmware, while the Nuki App relates to the full firmware revision.
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