I have a Lenovo T440s with Windows 10 up to date as of 9/29/16. I have been using Bluetooth headphones, but suddenly all the Bluetooth options from Settings and the Control Panel disappeared. When I go into Device Manager and show all hidden, everything under Bluetooth had Code 45 (Currently, this hardware device is not connected to the computer.) which is clearly not true. I tried updating the drivers, which didn't work. Then I tried uninstalling the drivers and reinstalling them with ones downloaded from the Lenovo website, but now no Bluetooth hardware shows up in Device Manager at all, even after restarting.
This has happened twice before in the past two months; the first time it was fixed by updating Windows, the second time was fixed by running a Lenovo update, None of which are currently available. This leads me to believe it isn't a hardware problem.
Any ideas? Thanks.