ITead’s “Sonoff Zigbee 3.0 USB Dongle Plus V2” (model "ZBDongle-E") based on Silicon Labs EFR32MG21 radio SoC/MCU

Again see this other thread which is more ontopic since interference for Zigbee is not specfic to this dongle → https://community.home-assistant.io/t/guide-for-zigbee-interference-avoidance-and-network-range-coverage-optimization/515752

There are several links to references there and more. Short answer is that all USB 3.0 ports and devices emit interference that seriously affect Zigbee.