Are you following these relevant general guidelines about avoiding EMF/EMI/RMI interference and adding many Zigbee Router devices? Among other things Zigbee best practice include the tip to use a powered USB 2.0 hub for the Zigbee dongle if your computer only has USB 3.0 ports (since connecting directly to a USB 3.0 port will cause serious interference) → Zigbee networks: how to guide for avoiding interference and optimize for getting better range + coverage
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