It's not just visual (although I've been hit with those, too). I was shooting a short video. Testing levels before shooting: visual good, audio levels good. Shoot video. A few hours latter, go to edit video. Visual good, audio... WHAT THE F*CK IS THAT BACKGROUND NOISE? Check the audio graphics. Yup, sharp noise, regular repeating intervals. Problem with the camera on the sound side? Electrical interference? Go back to the room I shot the video. Fortunately, the mantel clock decided to chime just as I came in... and after that, yup, the ticking of the clock was loud and obvious. 🤦‍♂️

Why yes, I AM am amateur! How did you know?