This is strange. I can understand your frustration.
As a fellow user, I’m now out of ideas. The only thing left is trying a powered USB HUB with the stick more than a meter away from you computer or other potentially interferering devices. This is something I had to do on all my 4 installations to get them stable. 3xRPi4 (w/SSDs) and a x86 Asus shoebox computer.
The only time I have come across the need to re-pair, was on a friends solar installations. He had a fridge running on the same 12V battery, and after a few overcast days, the voltage fluctuations made all (12V) devices reset themselves, same as when you do 5x power cycle. I cannot see this is your problem with mains powered devices.
My advice: get a good powered USB 2.0 HUB, with a sturdy USB-B connector and see if that helps.
Thanks anyhow. I’ll try a quality USB Hub… (however, if the reason for the behaviour is some kind of undervoltage of the Deconz stick, this would be the same for the devices as un- and replugging the stick, which works perfectly fine, so I’m a bit sceptical…)
I have not re-paired them all. But those paired again right now are not routed by those devices. Judging from the positioning of the devices I guess there are too many walls in between and the Ikea devices are in too many different places to all be routed by those two zigbee dimmers.
I also wonder why I always have to put the Tradfri plugs very close to the Zigbee stick in order to re-pair them. It does not work on their normal places, I have to put them within 1-2m of the stick for the pairing process?!
This points to bad radio coverage or interference.
Either as a whole, or just in the vicinity of the stick & PC.
When I switched to HUE HUB to deCONZ, I was able to re-pair all my 16 facade light bulbs many meters away, while still in the lamp enclosures, so your experience is not normal. (wooden house)
Just a thought; have you tried different Zigbee channels?
But, again; I had similar experiences on 4 different sites, all solved by using a powered USB HUB and placing the stick more than 50cm away from the computer.
I now use a powered hub. (Conbee has been connected witha 2m USB cable all the time.) The Ikea devices have not yet magically re-appeared, however.
As I said, the mesh seems dense enough IMHO and lots of other Zigbee devices work as expected, even if in almost the same position or much farther away. Many of them are cheap no-name products. It’s only the Ikea devices, disappearing from the net, and always all of them at once.
