To anyone having the problem where the keyboard will turn off and then re-connect, showing "connected" in Windows Bluetooth settings but not actually typing, I managed to fix it on my machine. Here's what I did - I can't promise it will work for you.
Setup: Windows 10 desktop, generic Bluetooth USB dongle with Broadcom BCM20702 Bluetooth adapter
When I first received my keyboard the Bluetooth driver was version 12.0.1.750, released in September of 2015. Broadcom doesn't seem to provide drivers on its own page - Windows just updates them automatically. This is a very common adapter type, so I looked around and found a Lenovo driver for one of the company's laptops that uses the same adapter:
http://support.lenovo.com/us/en/downloads/ds039810
I downloaded the EXE and ran it, which manually installed an older version of the driver, 12.0.0.9050. Once that was installed, I could turn the keyboard off and on, and now it reconnects and types as it should.
I have no idea why this driver downgrade worked for me. I don't know if it will work for you. But if you're feeling frustrated after paying a lot of money and waiting a long time to get a premium keyboard that isn't working correctly, I think it's worth a shot.
Setup: Windows 10 desktop, generic Bluetooth USB dongle with Broadcom BCM20702 Bluetooth adapter
When I first received my keyboard the Bluetooth driver was version 12.0.1.750, released in September of 2015. Broadcom doesn't seem to provide drivers on its own page - Windows just updates them automatically. This is a very common adapter type, so I looked around and found a Lenovo driver for one of the company's laptops that uses the same adapter:
http://support.lenovo.com/us/en/downloads/ds039810
I downloaded the EXE and ran it, which manually installed an older version of the driver, 12.0.0.9050. Once that was installed, I could turn the keyboard off and on, and now it reconnects and types as it should.
I have no idea why this driver downgrade worked for me. I don't know if it will work for you. But if you're feeling frustrated after paying a lot of money and waiting a long time to get a premium keyboard that isn't working correctly, I think it's worth a shot.