I've had these PLT headphones swap from phone to laptop when phone is playing music and laptop makes some noise (email notification, etc.) Whilst it's handy for the rare circumstances I want to start listening on the laptop without stopping the phone, it's a massive pain in the arse the other 99% of the time. Not least because it doesn't automatically switch back and start playing again.

I suspect it's the generic Bluetooth chipsets, mind, rather than anyone in particular because this happens with the PLT headphones and the Taotronics dongle I've got.