Firmware upgrade is probably a good idea and when doing that do change away from RCP Multi-PAN (multiprotocol) so move to Zigbee NCP only firmware if you have not already, see → https://skyconnect.home-assistant.io/about-firmware-options/
Also note that EMF interference and not using enough/good Zigbee Router devices can prevent proper Zigbee communication so make sure to follow all best practice tips, see → Zigbee networks: how to guide for avoiding interference + optimizing using Zigbee Router devices (repeaters/extenders) to get best possible range and coverage