ZigBee is sold as "it just works, and it is a mesh". The mesh part is true, but it is a mesh with rules, and almost every frustrating ZigBee problem I see is one of four rules being broken.
Rule 1: only mains-powered devices build the mesh
A ZigBee network has three roles. There is one coordinator, which is your hub or USB stick. There are routers, which are mains-powered devices — wall switches, smart sockets, in-wall modules, some relays. And there are sleepy end devices, which are battery-powered sensors that wake up, send a reading, and go back to sleep.
Battery devices do not relay anything. They cannot; they are asleep most of the time.
This is the single most common mistake. Someone builds a house full of battery door sensors and motion sensors, adds one hub, and then wonders why the far end of the house is unreliable. There is no mesh there. There is a hub and a lot of children hanging directly off it. Adding three smart plugs or replacing two light switches with smart switches will do more for that network than any amount of hub repositioning.
Rule 2: a switch is a router, and that is why switches are worth buying
This is the nice part of the category. A wall switch sits in the wall, is powered all the time, and is physically distributed across the house by the way buildings are wired. Every smart switch you install adds a routing node roughly where you need coverage.
So a house with six smart switches has a genuinely strong mesh. A house with six smart bulbs — bulbs are routers too when they are powered, which is the catch, because people turn them off at the wall — tends to have holes in it.
Rule 3: channels do overlap with Wi-Fi
ZigBee and Wi-Fi both live in 2.4 GHz. ZigBee channels 11, 15, 20 and 25 are the ones that sit between the commonly used Wi-Fi channels 1, 6 and 11. Most hubs pick a channel at setup time and then never change it.
If you moved your Wi-Fi around after setting up your ZigBee network, or if your neighbour's Wi-Fi is loud, the channel that was quiet a year ago may not be now. Symptoms look like "random" unreliability: fine for weeks, bad for days, fine again.
Changing the ZigBee channel on a coordinator usually triggers a network-wide migration, and in practice a minority of devices come back slowly or need a re-pair. Do it when you have time, not five minutes before you leave the house.
Rule 4: hops are not free
Each hop adds latency and each router has a limited number of children it will accept. Ten hops of ZigBee does not behave like one hop. A device that is "only" eight metres from the hub but through two brick walls may be routing through three devices to get there.
Practical range indoors is roughly 10–20 metres per hop in open air, less through brick, and noticeably less through anything with foil-backed insulation or a metal-backed kitchen.
The symptom table
Device was fine, then became unreachable after you added more devices: it is probably trying to reach the hub through a route that no longer exists. Re-pair it.
One switch occasionally triggers another: you almost certainly have a scene or binding configured, not a fault. Check bindings before you blame the mesh.
Everything responds slowly but eventually: too many hops, or a channel collision.
Only battery sensors drop off: your mesh has no routers. Add mains devices.
Everything dropped at once after a power cut: the coordinator came up before the routers did, and the routers never rejoined. Power-cycle the hub last, not first.
Replacing a hub is not a migration
Tuya's pairing is bound to the specific hub. If the hub dies, you re-pair everything. There is no standard "export the network to the new hub" step. Plan for it: keep a list of what is paired, and do the re-pair room by room rather than all at once.
The honest summary
ZigBee reliability is mostly a function of how many mains-powered devices you have and how well they are spread out — not of how expensive the hub was. If you want a stable network, buy routers (switches and sockets), spread them around, keep the channel sane, and treat re-pairing as routine maintenance rather than a failure.
Xingliao Smart Home builds smart switches, video doorbells and security cameras on Tuya WiFi and Tuya ZigBee, and runs OEM/ODM programmes from Shenzhen. Factory and ODM capability.
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