I've recently bought a Rift S. After playing with it for a while the left controller stopped tracking, the buttons still worked (i.e. I could make hand signals by pressing buttons) but the controller didn't move. I tried running through the Rift S setup again, but no luck. Eventually I had to uninstall and reinstall the Oculus app, and after that the controllers seemed to work. However, it has done it again, this time with the right controller. Why does this happen? The headset is new and there is no interference between the controllers and headset. I've raised a support ticket with Oculus about this, but thought I'd ask here too.