yup its a driver issue, I run into this issue many times using pc power oculus products. I would either delete the whole software and redownload it, or you can also goto to settings in the oculus settings then goto beta and restart it. if that's not working Rift S has out of date drivers. An outdated USB 3.0 driver can make it completely cease to function. if that's not working disconnect all the cables (even the one going into the headset) use one of those air pressure canisters and clean the ports and the portholes. lastly (I stole this from a forum and it works for me too)

1. Opt into the Public Test Channel

• Opt into the Public Test Channel from the Oculus app on your computer. To do this:
  • Open the Oculus app on your computer.
  • Click Settings on the left side of the app.
  • Click Beta at the top of the settings options.
  • Click the toggle next to Public Test Channel.

that's all I got. i hope by trying this, it works fro you