I have a different problem on a similar subject, my bluetooth 7.1 surround sound headset receives audio in and out and can never keep a constant stream of sound, but only when connected to the onboard bluetooth on the computer. Alternatively my portable bluetooth stick doesn't have these problems. I suppose since the bluetooth device is around all kinds of interfering components, it was never meant for headsets, but I could be wrong.
I looked this up online, but no help was provided aside from suggestions of swapping bluetooth stacks, but the widcomm and toshiba stacks appear not to work with the one on the motherboard. I don't think it should make a difference however, since from using the Windows Stack with my portable stick it works just fine.