As above, very likely that you are simply having EMF/EMI/RMI interference issues with the Zigbee Coordinator and/or Zigbee Router, or might also be that you do not Zigbee Router devices within close range in your Zigbee network, so before you do any deeper troubleshooting (as in digging through debug logs) be sure that you are first following these best practise tips → Zigbee networks: how to guide for avoiding interference and optimize for getting better range + coverage
At the very least make sure both use a long USB extension cable to a USB 2.0 port or USB 2.0 hub to avoid interference as well as make sure have enough Zigbee Router devices on the same Zigbee network), so read and make an effort to follow those best practices.