All of these devices are within range of the coordinator, with the farthest being maybe 8m and so all within very close range of each other.
When this happens it takes a HA restart to get them working again. (Although I haven’t tried just reloading ZHA in this instance)
It could just be that dual switch sending out too much chatter on the network causing the issue perhaps.
Yes but through what kind of materials/walls? Also, are the routers closer to the ground or higher up? Etc…
I am not saying you are wrong, just that in my experience lots of things can affect radio propagation, besides distance.
Examine network map, and/or look at LQI of connected devices. Although I guess you are using ZHA, as your map looks different than mine (I use Z2M).
Alternatively, disconnect power from the new device, to see if things work better. You might have to re-pair some other routers, or wait some time for them to ‘heal’ the network. And then of course, some devices from certain mfrs. are known to be ‘sticky’ instead of switching to some other device with a better signal.
Could be some combination of issues with this specific hardware in combination with those other router devices. Maybe try moving some things around or adding some other router devices, perhaps from different mfrs. even?
Interesting. I just had a look and I have 44 devices, 24 end and 20 router.
I seem to have a few sensors dropping off here and there, But I did not even begin to look into that yet at all, and I don’t want to hijack this thread, so I will make my own thread later.
For now I will just follow along, and perhaps learn a little more about Zigbee generally which may help me with my own network.
Cheers! 
I have 13 router devices (9 smart plugs and 3 hue bulbs, 1 hue led strip) and 10 end devices (3 motion sensors, a temp sensor, a leak sensor being used as a bed occupancy sensor and the rest are light switches for the ceiling lights).
All are stable at this time in my small unit.
Waiting to see what is said about that double light switch that was added when the issue started in his setup.
I agree, this also sounds to me like the problem in this case. At least that’s where I would also begin looking, since that seems to be when the problems started.
Eight metres is quite a long way. Mine are 10-15 feet apart. They don’t need to be in range of the coordinator - messages get passed from router to router and the important thing is to make sure there are lots of alternative routes for them to take.
Another thing to bear in mind is that not all routers are created equal. Bulbs are likely to be less effective than plugs, for example. You might try adding two or three “repeaters” (ie routers that do nothing else) - I have at least one in every room.
Has anyone given you this link?
I linked them the entire zigbee cookbook section my first link.
That’s to the furthest router though, there are others within that distance. The thing is, this issue is not frequent at all. eg: it hasn’t happened again since my first post 4 days ago.
The dual switch which is the latest addition to the Zigbee network is only roughly 3m from the coordinator. I have another one or two of the Sercomm sockets so I’ll add that in somewhere close by as well. Unfortunately I didn’t have time to work on this over the weekend.
UPDATE: yesterday the dual light switch became unresponsive so I’m definitely thinking this is the culprit for network issues. Currently trying to investigate further.
There are a lot of factors that play into network issues. The first thing to do is review that cookbook that @Sir_Goodenough linked because it’s great information. On a high level, here’s what I look for in my network:
Those are my go-to’s. Aside from that there’s some outstanding advice already given.
I have gone through all that which has let me to where I am.
Using Zigbee channel 15
Routers are throughout the house, which is quite open plan.
Issue only arose recently, which seems to coincide with the dual light switch being installed.
Nearest wifi device would be the nearest AP which is about 4m away on the other side of a brick wall from the suspect light switch.
There are a couple of low battery devices which I’ll look into, so thats a good one.
The devices that are playing up… light switch is Tuya (so not a great start) and the others that get affected during this issue are Sercomm (rebranded to Telstra which is an Australian telco)
I’ve contacted the supplier of the light switch because I think this is causing the network issues given that everything was perfectly fine prior to it’s install. I guess my question now is how to debug that particular device…
Sounds like a good start. Why not just turn off the power to it and see how or if things react to that?
Again, if the angle is steep enough your couch becomes a mangled 20’ mess of wire springs and wooden frame. This goes back to wifi setups where placement is everything for good coverage. Also channel 15 is often chatty, have you checked your Zigbee diagnostics to see what your channel utilization looks like?
Is that this bit?
},
"energy_scan": {
"11": 27.058823529411764,
"12": 41.1764705882353,
"13": 47.05882352941177,
"14": 30.58823529411765,
"15": 55.294117647058826,
"16": 52.94117647058823,
"17": 72.94117647058823,
"18": 68.23529411764706,
"19": 55.294117647058826,
"20": 56.470588235294116,
"21": 83.52941176470588,
"22": 83.52941176470588,
"23": 42.35294117647059,
"24": 32.94117647058823,
"25": 27.058823529411764,
"26": 38.8235294117647
},
That’s the one and 15 looks pretty good! Better than my 15 haha.
So should I be using a channel that has a low value in that list such as 25 instead?
My current setup had defaulted to 25 when I first set it up, you are best to just check what channels are the best overall for your setup as you may need to recreate the setup to apply the channel changes when testing.
Some devices don’t like 25, more don’t like 26. You can play with them but honestly at 55 your channel 15 is pretty good - BUT look at the cookbook because there is overlap with wifi and that could still be your problem.
In general, yes. However maybe at your house all the neighbors (and/or your own) Wi-Fi might be crowding that part of the spectrum. So you want to check it. I use an Android app (from F-Droid) called WiFiAnalyzer (but there are others) and just walk around and have a look.
