Unlike other posts which report an occasional chirp, this whine is continuous and does not stop. I have my Ultra connected to my receiver, and this is the only device that does this. My older Roku was plugged into the same receiver port with the same HDMI cable and did not have this issue. Multiple power cycles sometimes help for a while, but the issue always comes back.
I'm getting ready to toss my Ultra because of this issue and write a scathing review on Amazon if I can't get this resolved.