Best way to troubleshoot ZHA losing all devices?

Yeah you should not bw using the Multi-PAN RCP / multiprotocol firmware. Disable multiprotocol and flash the EmberZNet NCP firmware instead. Buy a seperate radio dongle for Thread protocol.

That is not so, it does not sound like you read and understood it as it also covers best practices and actions that everyone should take regardless of setup, and if you now only have two Zigbee Router devices then you are not following those best practice tips, because Zigbee relies heavily on Zigbee Routers and mesh networking (which battery devices can not do on their own). It also mentions that multiprotocol firmware is not recommend and that should use a dedicated radio dongle with NCP firmware for Zigbee-> Zigbee networks: how to guide for avoiding interference + optimize using Zigbee Router devices (repeaters/extenders) to get a stable mesh network with best possible range and coverage

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