HSM suddenly changed modes to "away" while we were both home. I was able to catch it before the exit timeout to change it back. I then noticed that there was a message, "Zigbee Network offline." When I pulled up the Zigbee details, I noticed that the Zigbee channel which has always been set on 20 was showing channel 11. I did not change this. I changed it back to 20 and got the message that it was changing. When the message cleared, it was still showing 11. I refreshed the screen and then I saw that it was back on 20, and the Zigbee Network offline message was no longer showing.
What would cause the Zigbee network to go offline?
What would cause the Zigbee channel to change?
Fortunately, it looks like everything is back to normal. I would like to avoid this happening again if I can.
The radio going offline can be caused by elevated load on the hub. A reboot often fixes the immediate issue, but if that is the cause, then some more investigation would be necessary.
As for changing channel, I wonder whether another nearby hub was using 20?
My second hub is on channel 25, so I don't think so.
Edit:
I do have Hub Information installed and have a rule to reboot the hub when memory drops below a setpoint. That has happened a couple of times since I set that up. I'm not sure what would cause the elevated load or the change in channel.
I am an amateur radio operator, but I do not operate on the 2.4 GHz band. 2.5 MHz is the lowest and 450 MHz is the highest frequency I use.
I've had multiple events like this, mostly with my C4 hub. My experience is that the hub is easily overwhelmed, with chatty devices and LAN connected devices. When the hub is overloaded the zigbee network is the first to crash.
Let us know which devices you have and which apps you have loaded.
With mine, a shutdown and power disconnect allowed things to recover(disconnect power from the wall, not the hub-connector, it's tiny and weak)
I have a combination of Iris V2 motion sensors, contact sensors, a V2 and V1 keypad along with Bosch motion sensors, GE/Jasco Zigbee smart switches and dimmers, and some other Zigbee switches. It wasn't the radio crashing. I know that can be fixed with a reboot. It was the Zigbee chanel changing from 20 to 11 that surprised me. I can't figure out what might have caused that. This is on a C7 hub. I have a separate C5 hub that contains all my other Iris V1 motion and contact sensors. The C7 hub is on channel 20, the C5 hub is on channel 25. I have another C7 hub that I ordered and have on hand. One of these days, it will replace the C5 hub, but I'm not in a hurry to do so.
I just checked my C7 hub when I walked into my office and the lights didn't turn on (multiple motion sensors) and saw this "zigbee network offline."
Reboot did not bring it back. I checked my other C5 hubs and it looks like one of them stepped on the channel the C7 was using. I had to change the other and shutdown/restart the C7, it came back up on 20.
Is there something going on in the code? I have 2.3.2.128 on all 3 hubs.
Could still be overloading the front end of the receiver but I kinda doubt it, unless you're doing EME or something running a similar amount of power
Do you use hub mesh? I ignored the documentation and had about 500 devices meshed. That would overload my hub and shut down the zigbee radio. It was difficult to track down since it did not show up in any of the logs... but scaling back mesh to just the devices I actually need seems to have resolved the issue.
I did just get an Ameritron ALS-1300 amplifier which puts out about 1200 watts, although I drive it for a lower power output. That might be a factor. Yes, I do use Hub Mesh with the two hubs and have not had problems with it since I have only 11 Iris V1 devices on the second hub linked through Hub Mesh.
I may need to relocate my hubs to be farther away from the side of the house where one of my antennas is located and also farther away from the radio equipment.
I don't do CW, just SSB voice. I use a straight key on CW at 5W to activate the tuner (Palstar HF-Auto) to tune, but that is all until I can learn Morse code.
The three IRIS V1 outlets are repeaters. They are on the mesh. The rest of the Zigbee repeaters (GE/Jasco switches, 2 Nue 3A dimmers) are on the main hub and not linked through the mesh.
I was thinking you had motion sensors not the outlets. You don't have the V1's set up for both z-wave and zigbee (they contain both radios from what I remember and hooking up z-wave to them causes all sorts of issues)
I shut down the z-wave repeater on all mine, after having previously successfully paired them all, but they never caused any zigbee issues and I've not had any up until today (last night). The z-wave on them has been shut down for months.
I don't think I ever successfully set up the Z-Wave part of them. I only have a couple of Z-Wave devices, and they are close enough to the hubs that a repeater is not really needed.
