Zigbee is a brilliant and energy-efficient protocol, but you can't cheat physics. If your devices aren't responding, have delays, or suddenly "drop off" the network, it's rarely a hardware failure. Most often, it's the result of a bad radio environment, network conflicts, or incorrect hardware setup. See what's killing your range.
Your Wi-Fi router and Zigbee devices share the same 2.4 GHz airspace. Wi-Fi is a "loud concert", while Zigbee is a "quiet conversation". If they operate on overlapping channels, your home router will simply drown out the sensors. Choosing a non-overlapping channel is the absolute foundation of stability.
Are you plugging your coordinator (e.g., Sonoff Dongle) directly into a blue USB port on your terminal or Raspberry Pi? That's a mistake that drastically cuts your range. USB 3.0 ports generate massive electromagnetic "noise". The fix is simple: use a USB 2.0 extension cable and physically move the device away from the computer.
Zigbee is a mesh network. Battery-powered devices (motion sensors, thermometers) "sleep" and don't pass the signal on. For the network to have strong coverage throughout the house, you need permanently powered devices plugged into outlets (e.g., smart plugs, bulbs). They act as routers, amplifying and forwarding the signal to the furthest corners.
We can't cheat physics remotely, but you don't have to guess where the problem lies. As part of a free diagnosis, I will connect to your system, analyze the LQI map, and locate the source of interference.
Once we determine the cause, you can decide on the next steps. As part of a paid service, I will handle the safe reconfiguration and stabilization of the software (changing channels, optimizing ZHA/Zigbee2MQTT), and you can make any necessary hardware adjustments based on my recommendations.