Okay I stand corrected this is definitely a bluetooth driver issue, although we are led to believe that apple have updated all their drivers in BootCamp V6 to be compatible with Windows 10 it seems the Apple Broadcom Built-in Bluetooth driver is NOT Windows 10 compatible!
Although BootCamp shows its installed the bluetooth driver but it is NOT and even when I do it manually via device manager it installs but does not work the "Apple Broadcom Built-in Bluetooth" icon has a yellow warning triangle on it.
So basically when you try to update the driver via device manager Windows defaults to standard Microsoft Bluetooth Stack - bluetooth radio. see attached image. This driver actually works very well other than what I have already stated in my last post that the audio stutters when Bluetooth devices settings is open.
It's frustrating that apple don't really care much about Bootcamp drivers and take their sweet time to update them. I don't understand the logic as the end user will have a poor experience with Windows on Mac, then what's the point of even providing bootcamp?? Or is it so that because of the poor experience the end user will stick with Mac???
If anyone has solution or workaround to this please post here.