Folks, please answer this question as if I were a complete #hardware nitwit, because I really am.
My trusted Razer Kiyo USB #webcam appears to be in its death throes. It looks like it's getting detected just fine, and I can use it for about two seconds, at which point it freezes and appears to upset all my USB devices (?), and becomes unusable. It does this on two different machines, so I think it is the camera, as opposed to a local USB problem.