Hello I’ve had this same problem on two different systems. On the first It was a bandwidth issue, but i’m posting because of what I’ve experienced on my second.
My kinect 2 was reconnecting constantly which was visible by the lights on it turning off, and by watching the kinect configuration viewer. I tried everything from changing ports, to installing drivers, chipsets, updating bios, turning off legacy usb support in bios, turning off usb selective suspend in power options.
The solution makes no sense, but it turns out disabling the kinect microphone in recording devices caused this behaviour. Enabling it instantly fixed it…
I found the solution here. Hopefully this helps someone someday.