If you're still having trouble try this Phil, its worked for me.
1 - Carry out the advice regarding going to Device Manager - Human Interface Devices - Bluetooth Low Energy GATT... - Power Management - and uncheck Allow the computer to turn off this device to save power...
2 - Then also go back to Device Manager - Bluetooth - Power Management - Qualcomm Atheros QCA61x4 Bluetooth - click that and uncheck the Allow the computer to turn off this device to save poweroption.
Hope it works for you. Regards.
Mike.