WOW! Thanks for the link to your personal background story and describing all your test results.
Yeah, I also have some CASE Session timeouts in my logs. But I do not have any Matter over Thread devices going offline every now and then. I did not see any devices going offline since round about 2 months. Oh wait, not true. I had an EVE Weather some days ago with an empty battery.
I have 7 Apple Thread Border Routers (2 hardwired AppleTV 4K 3rd Gen, 4 HomePod Minis and 1 HomePod v2). You already know that.
My Thread channel is 25. I have two 2 floors. On every floor is one of the hardwired AppleTVs. On the main floor I have 2 Unifi APs and on the top floor I have 1 Unifi AP. I do not use 2.4GHz WiFi channel 11 to reduce interferences between WiFi and Thread.
I really don't know what I can say to your statements except that my system is rock solid, reliable and fast.
Some month ago I had to reduce my Thread network traffic generated by Multi-Admin, because my environment got unstable:
- My 39 EVE MoT devices are paired to Apple Home and Home Assistant.
- My 26 Nanoleaf MoT bulbs are paired to Home Assistant only.
Unpairing all my Nanoleaf bulbs from Apple Home was enough to get the stability back.
My HomePods are locked to the next AP by the Unifi Network Application. Since I locked my HomePods to my APs and did all the updates I do not see partitions in my Thread network anymore.
Itβs really hard to say, where issues have their source. Next to interference reduction, reducing Multi-Thread network traffic, there were a lot of updates:
- HAOS and HA Matter Server
- Apple OS (17 to 18)
- Unifi
I am using the Unifi beta firmware on my APs since years. I gave them some support files months ago. They found issues in my logs relevant to MoT and they told me that they are working on fixing those issues. At least I think they did that, because everything feels good.