Razer Blade Stealth, Intel 9260 AC adapter, Jaybird X2 headset. I went to Control Panel\Devices and Printers\Right clicked on my Bluetooth headset and clicked Properties. Went to the Services tab. The services for it listed were Audio Sink, Handsfree Telephony, Remote Control, Remotely Controllable Device, and Unknown Service. I played with disabling them one by one. Finally landed on disabling Handsfree Telephony and Remotely Controllable Device to fully fix my stuttering. The Vol+ and Vol- still work. However, holding the center button no longer invokes Cortana, which isn't a show stopper for me.
This definitely seems to have fixed it for me. I have an msi ge65 Raider. Did you ever get a permanent solution to this though?