Here are two videos I did last night. One is with the infrared (IR) on (the red light), and one off. I had a flashlight and as I turned it on or off, you’ll hear the clicking noise about a second later. Doesn’t matter if you have the IR on, or not.
Hope this helps with diagnosis!
The clicking is loud and can be heard across a room. Especially under quieter conditins at night. No question.
With IR Light:
https://www.youtube.com/watch?v=hsURSFKS980
Without IR Light:
https://www.youtube.com/watch?v=2gU30fLToMA
I’ve tried this with all three of my indoor cams with the same result.