After the firmware update (as well as before the update), I paired multiple headphones and BT speakers and noticed I could be playing some music from the built in speakers and notice the music never automatically switches to the BT device even though my headphones state they are connected. I also check my BT settings and it shows the device is connected. For some reason my SP4 keeps forgetting to switch the audio to the BT device. Is this normal for the SP4 or is this just a windows 10 typical issue? The only fix I have found was to unpair and repair my device. This really doesn't seem practical to me.