Zigbee2MQTT running unstable

Yes if using Zigbee2MQTT then Texas Instruments adapters are preferred, though EZSP support in Zigbee2MQTT is getting better, follow → https://github.com/Koenkk/zigbee-herdsman/issues/319

Anyway, it is generally not recommended to use Silicon Labs EmberZNet based Zigbee adapter over LAN unless using a rock-solid Ethernet network, so especially do not use WiFi, because the EZSP serial protocol it uses does not have enough fault-tolerance to handle packet loss or latency delays.

Also check out → Guide for Zigbee interference avoidance and network range/coverage optimization

I mention there that possible it will be better to just use a very long USB extension cable instead, and should know you can simply buy inexpensive USB to RJ-45 adapters that will convert any network cable into a USB cable. See for example → https://www.amazon.com/Cat6%EF%BC%8CSNLLMZI-Extender-Extension-Connector-Adapter/dp/B08FMLGNQN

See warnings:

https://www.zigbee2mqtt.io/advanced/remote-adapter/connect_to_a_remote_sonoff_zbbridge.html

https://www.home-assistant.io/integrations/zha#warning-about-wi-fi-based-zigbee-to-serial-bridgesgateways