Welcome and thank you for posting here in the Roku Community, @Aaaaaaa!
Firstly, we sincerely apologize for any inconvenience this may have caused you, and no worries! We're here to find you the best resolution possible.
Before we proceed, may we know what specific Roku player this remote is connected to and is this the remote that comes with the device? Also, when did you first notice that high pitch noise?
In the meantime, we suggest pressing and holding the Back and Home buttons simultaneously for about 30 seconds to reset it. After doing so, re-pair it again to see if this will stop the noise and make any difference.
Please let us know how it goes and we'll continue assisting you from there. We'll be anticipating your response!
Best regards,
Carly
Carly Y.
Roku Community Moderator