I'm happy to provide any further technical info. I'm trying to get support via Gigabyte as they are the PCI-E card manufacturers, but maybe someone can shed some light in here. Microsoft support, as always, is useless. No UEFI/BIOS changes were made since the system arrived in February 2017 and the UEFI/BIOS is the latest as provided by the manufacturer (this is a non-Gigabyte MoBo). All other drivers are too updated - worth mention drivers were already updated at least 10 days prior to the Windows update, with zero issues found. BT drivers are updated to their latest version 19.50.1 as found on Intel website. This card worked flawlessly for the entire month of March and up until the Creator's update patch in early April. I tried to re-seat the PCI-E x1 card, the Intel 8260 card itself, changed USB cables and ports (as the BT adapter requires a USB connection), remove drivers and reinstall them, all to no avail. The wireless portion of the card works perfectly. After the Windows 10 Creator's Update, the Bluetooth piece of the Gigabyte GC-WB867D-I Rev 4.2 card (powered by an Intel Wireless-AC 8260 adapter) is not being detected at all (completely gone from Windows Device Manager).

Gigabyte gc wb867d i windows 10