Do not know the root cause but note that the use of adapter: ezsp is now deprecated in Zigbee2MQTT. Sounds like you have not migrated from Z2M’s old deprecated “ezsp” driver (adapter) to their new “ember” driver (which also requires newer firmware). See [WIP]: EFR32 EZSP adapter implementation and test · Issue #319 · Koenkk/zigbee-herdsman · GitHub which in turn refers to → New ember adapter implementation targeting EZSP 13 and above by Nerivec · Pull Request #918 · Koenkk/zigbee-herdsman · GitHub
If you have more questions then suggest you ask in Zigbee2MQTT’s own community channels since that is all Zigbee2MQTT issues and not directly related to Home Assistant (as Zigbee2MQTT is a seperate application and have their own commuinity and issues trackers):
PS: You should however first make sure that you are at least following these generic best practice tips → 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