I've had a similar problem once every couple of months for the last year or so. I don't know a "solution" that fixes it forever, but I do have a procedure to get it back up and working.
Start menu, gear control
Search for Startup, choose Change Advanced Startup Options
Advanced Startup – Restart Now
Choose an option
Troubleshoot
Advanced Options
UEFI Firmware Settings
Restart
It's going to start up with the UEFO Firmware settings. Disable wi-fi, save and let the PC restart. Bluetooth should be back at this point.
Do this restart procedure again, this time enabling wi-fi.