We're here to help. Does this clear up the issue you are seeing? If you still need additional support, can you please provide more information about the issue you are experiencing? What troubleshooting steps have you taken so far to try to resolve the issue?
I had on ongoing issue with that noise. First, Roku issued me a replacement Ultra that was the same model as what I had. Sure enough, the noise continued.
When I called again, they offered to send another replacement. This time, however, after firmly but respectfully stating that another straight-up replacement was unacceptable, Roku sent me a more current model, Number 4802R. I've had it a little over a month and have NOT had any noise issues!
Sorry to hear this has been your experience. We can see that the issue occurs on a Roku TV. Have you tried contacting the TV manufacturer to inquire further? I'd suggest starting there to see what options or suggestions they can provide. Each Roku TV manufacturer provides direct support and warranty services for their products running the Roku OS.