I bought our Roku a month ago. The remote stopped working so I changed the batteries. Now, the remote makes a very loud whistling sound every few minutes. I changed the batteries again and paired the remote with the tv again, it is still making the noise.
Is this a model that includes a remote finder button on top? None of my Rokus have this feature so I don't know what sort of noise the finder makes by default (although I've read it can be changed), or whether the noise it makes is continuous or intermittent. If have one of these models, see if there us something depressing the button, or if the button is stuck in the depressed position.
Please send me a PM with your Roku account email address, and include the serial number of the Roku device from Settings>System>About along with a summary of the issue you are experiencing. I'll be able to assist you further from there.