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Logitech has a really nice backlit K810 Bluetooth keyboard that many folks had been using with their Surface Pro 3 tablets successfully and without problems. After the 9/9/2014 updates, reports started surfacing (pun intended) on the Communities Surface Forums http://answers.microsoft.com/en-us/surface/forum/surfpro3-surfdevice/logitech-k810-and-new-surface-pro-3-firmware/5550000b-af2f-46f7-9c06-53bc887145e4?msgId=78d9c656-6234-4601-b3a2-e98071999570 and the third party forum at http://www.surfaceforums.net/threads/logitech-k810-keyboard-and-9-9-14-firmware-update.11391/ . A thread has been started on the Logitech Forums http://forums.logitech.com/t5/Keyboards-and-Keyboard-Mice/Logitech-K810-Surface-Pro-3-and-SetPoint-not-playing-nicely/m-p/1316053 as well.
It turns out that the September Surface Pro 3 driver firmware/update for the Marvell WLAN/BT adapter now conflicts with the Logitech Setpoint control software for the K810 keyboard. The keyboard pairs, but immediately goes into a connect/reconnect loop and may display a driver error.
Work Around:
Users are confirming that uninstalling the Setpoint software (which again, worked prior to this update without issue) resolves the disconnect loop, but of course prevents setting up Function Keys permanently, etc.