Hi @Kerrytog
Thanks for posting in our business forum.
First, the buzzing sound may not come from the switch. It could be anything buzzing from a power outlet to the power adapter.
Could you confirm where the sound comes from? If you are certain it is coming from the switch, you can contact the support and express your request.
Second, buzzing does not mean it is bad or broken. You should still verify whether it is working or not. Please describe what you see from the front panel of the interface.
Third, if it is your power adapter buzzing or the connector on the switch, reconnect them or change a new power outlet/strip to try. It could be a loose cable.
If your expectation is to get an RMA, contact the technical support for further assistance and troubleshooting before they issue an approval.
Note that the fee to ship back the device is not covered, you should pay this shipping fee to send the unit back to us.