Why am I losing Bluetooth connection with call waiting?

[4dandroid]

Losing Bluetooth connection with call waiting

I rarely talk long on my phone, but have been doing so more lately. This has happened twice now. I am talking on my N6 using my Plantronics Bluetooth headset. When I receive another call, I lose the Bluetooth connectivity. I have to switch my headset off and on to restore it. My phone is not rooted and I have yet to receive Marshmallow.

Thanks.