I had some luck on this one.
I initially onboarded my nanoleafs into home assistant using Apple TV as preferred thread router & my ios device, this resulted in the unavaliable issue dropping in and out etc.
I have google nest wifi pros as my home mesh network, I was also able to find a spare android device, so I decided to swap the google nest wifi pros as the preferred network then re onboard the nanoleafs using android.
Since doing this i have not had a single drop out. not sure if that will help anyone but it worked for me so thought I’d share.
It’s an unfortunate solution as means I can’t use my primary phone to onboard new matter devices. but it works
I have the same issue with nanoleaf, however it’s only happening with the GU10 lights.
These are the details:
I installed 3 GU10 Thread/Matter lights. All three stop communicating with Home Assistant after a couple of days.
They don’t seem to lose connection with Apple Home and I can still control them from the Home app while they are offline with Home Assistant.
I also have a nanoleaf lightbulb and downlight installed, all Thread/Matter as well. None of them seem to have any issues.
Additionally I have an Eve smart plug. No issues there either.
I’m using Apple HomePod / HomePod minis as border gateways.
All software is up to the latest version (lights firmware, Homeassistant, HomePods, etc.)
First time it happened, I restarted Home Assistant and the Matter add-on and the light reconnected. This morning that didn’t solve it, once I restarted the HomePod mini, Home Assistant reconnected.
There seems to be an incompatibility issue between Home Assistant / HomePods / GU10 lights. I’ve seen that people that run Google border gateways don’t seem to have this issue either.
I bought a bunch of nanoleaf lights and was getting to replace a lot of them when this started happening. Now I’m rethinking what’ll do.
Happy to provide log files or work with anyone willing to look into this issue.
This is a sample of the errors I’m getting on Matter:
2025-11-13 05:59:10.365 (Dummy-2) CHIP_ERROR [chip.native.EM] <<5 [E:18689i with Node: <0000000000000000, 0> S:0 M:55486627] (U) Msg Retransmission to 0:0000000000000000 failure (max retries:4)
2025-11-13 05:59:17.577 (Dummy-2) CHIP_ERROR [chip.native.SC] CASESession timed out while waiting for a response from peer <0000000000000012, 1>. Current state was 4
2025-11-13 05:59:17.578 (MainThread) WARNING [matter_server.server.device_controller] <Node:18> Setup for node failed: Unable to establish CASE session with Node 18
I have an old NanoLeaf Essentials (not a GU10 type), but it is know that the early version of firmware for it was, shall we say, not good for connectivity. I was able to upgrade the firmware on it using the NL App to the latest and AFAIK, it does not have the connectivity problems any more.
