Zigbee fully down

I see you did not follow best practices for creating stable Zigbee network.

https://support.homey.app/hc/en-us/articles/360019239879-Creating-a-stable-Zigbee-network-with-Homey-Pro

Also some info on inability to pair devices

https://support.homey.app/hc/en-us/articles/360019240259-Resolving-Zigbee-pairing-issues

Last but not least, check recommendations provided you by this script