bluetooth keeps disconnecting
WP does not maintain a constant active BT connection with a PC if there is nothing happening, i.e. if you want to reassignment a file, the connection will be established when you initiate the reassignment and will disconnect once it is complete. This behaviour is
perfectly normal in this case.
WP’s ability to play music through a BT headset is clearly known in all phone specifications, you just probably do not know what A2DP means.
I have been playing music through a BT headset on many different WP handsets for more than 4 years now.