USB3 has a bug in its specification which causes some interferences on the 2.4GHz band. This yields to a massiv signal strength drop to a zigbee usb stick if you have something plugged in next to it in a USB3 slot. https://youtu.be/tHqZhNcFEvA?si=l7do_2YtG8DH4hJW This video from HomeAssistant demonstrates the effect very nicely.

The conbee 3 was just approved by some licensing agency.

But I would recommend the Sonoff Zigbee Gateway ZBDongle E. Upgraded to this with ZHA from Conbee 2 and deconz and it works much more reliable and faster.

But most important: Don’t forget that 2 m USB2 cable to prevent the USB3 interference bug.