Zigbee Connectivity issues: Zigbee devices stopped responding, goes unresponsive

Place the Zigbee devices next to the Zigbee hub/bridge during pairing or software OTA update.

Some common factors can affect Zigbee connections, please try a few things for general Zigbee troubleshooting:

Make sure there is no battery level issue for the Zigbee device.
Place the Zigbee device near the Zigbee hub/smart bridge or the Zigbee repeater(Zigbee plug/switch etc.) during pairing or software OTA update, we suggest no more than 600 inches(15 meters) in open space.
Avoid metal surfaces when mounting the Zigbee devices.
Clear the area around your Zigbee hub: Move any wireless devices like Wi-Fi routers, or other hubs at least a meter away from the hub. These devices can sometimes mess with Zigbee signals.
Check your Wi-Fi router settings: Some Wi-Fi routers can interfere with Zigbee signals if they’re on the same channel. See if you can change your Wi-Fi router channel to a different one (maybe channel 1 or 6) and see if that helps.