I've had this problem for a while and I finally tracked down the source of the problem. I have the Rift that included the Xbox One controller and wireless adaptor. What I have found is that if I use the controller in a Rift game, after the controller hibernates, it will not re-connect to the wireless adaptor. The white light on the wireless adapter will blink and the Xbox controller will go from flashing, to bright, to dim, and then turn off. In the past I have had to reset the computer and then it works fine. But I have now discovered it is the Rift software that is causing this. All I have to do is restart the Rift home software and then turn on the controller again and it connects and works just fine. Wired Xbox controllers are not affected by this bug. It has done this since I got the Rift last year (many software updates) and I thought it was a faulty wireless adapter this entire time. It seems like what is happening is that the Rift software is locking the wireless adapter out from Windows. Because once the controller goes into hibernate and the Rift software is still running, the wireless adapter does not show up in Device Manager. You can see Device Manager refresh when you unplug/plug the adapter in, but it doesn't actually show up. Restart the Rift software and everything is back to good and the adapter shows up in Device Manager. Just food for thought, in case any of you run into this problem.