I think the knock sound is a glitch with Wyze. I have one in the unoccupied house of my mother in law that records the exact same sound that’s in the first videos on this thread. I mean exact same sound. It is hard to believe that my camera has the exact same sound that someone else’s camera picked up and its source is paranormal. It’s got to be something with the Wyze camera. One interesting note: She has a pergo type floor where the camera is set up. My wife was at the house and I was watching it live stream I called my wife to get her and try and duplicate the type of sound. When she stomped her heel on the floor it made a very similar if not identical sound that the Wyze camera records randomly