You can’t identify why, ZigBee do not have such monitoring but you can :
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check battery states of the sensors
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check if your ZigBee network is build correctly
https://support.homey.app/hc/en-us/articles/360019239879-Creating-a-stable-Zigbee-network-with-Homey-Pro
[Community Survey] Homey v5 ZigBee Health check and statistics collection (HomeyScript) -
monitor devices in case they are not responding
Also in case you have problem with English, search on Facebook for Czech Homey group