For years I have had my zigbee network functional with a ConBee2 zigbee coordinator in my home assistant box.
But this week, devices started to randomly drop off the zigbee network. I could re-pair them and get them in again. But yesterday, it suddenly dropped 24 devices… Sensors, buttons and lightbulbs seem to be the most common ones.
I’ve restarted the ZHA integration, restarted the docker container, even downgraded to 2026.8.3. Still the same.
I checked the Home-Assistant github repo issues and there are lots of issues regarding zigbee and dropped devices in the last 2-3 weeks.
Does anyone have any suggestions as to why this happened all of the sudden?
The zigbee network has been stable for years before this.
Have you made any changes to your network or bought any new devices in the last week?
I once had a new house battery (SigEnergy) interfere with my smart lights by spamming my network with discovery packets.
I have not added anything new in the last couple of months.
Never dealt with anything like that but I’m using a Sonoff Dongle-E myself.
I would wonder is maybe you are at a device limit or maybe have a device that is throwing errors. A Dongle-E is running 25.00 on Amazon. The newest version the Dongle-P is 40. It’s a small price to pay to test things against and even potentially solve the problem. Update the firmware to the latest version and transfer 1 Device to it. Every couple weeks switch another. If you have a dropout on the new one you know it could be a device in that pool having an issue or the zigbee coordinator at fault.
And while the design device threshold is pretty high design vs reality are two different things. A lot of people have issues with more than a handful of wifi devices but theoretically there should be no issue or limit, this also depends on if a person is using cheap residential or commercial grade hardware. If things stabilize after you transfer a few devices that may be the issue. I would spit them in half and move on with my day.
I could be close to the limit, I have about 46 devices on the ConBee2. But it is a new problem, I would have thought this would be happening as soon as I started nearing the limit, not months after it.
