Procedure & tools for troubleshooting Zigbee?

Recently my zigbee network has become less reliable. I don’t know why.

  1. My wifi channels don’t overlap with the zigbee frequency
  2. The conbee dongle is far from any WIFI or USB3
  3. The dongle is attached with a usb extension cable.
  4. The network used to be reasonably reliable.
  5. Wifi seems to work reliably

How should I go on about troubleshooting? Any tools for revealing interference, whether wifi, zigbee, bluetooth, or something completely different?

Hello, perhaps taking a look on logs ?