Z2M can not reach the devices on your network.
This document will give you some pointers on how to make your zigbee mesh network more reliable: Zigbee network optimization: a how-to guide for avoiding radio frequency interference + adding Zigbee Router devices (repeaters/extenders) to get a stable Zigbee network mesh with best possible range and coverage by fully utilizing Zigbee mesh networking
More here: https://community.home-assistant.io/t/the-home-assistant-cookbook-index/707144