Yep BH-214 disconnects after around 10-30 seconds. If you listen closely as I remember you can hear rasp or a beep, after that its disconnected. But this doesnt have to do with KP48, its the same in KP47 and stock kernel too (I think). As far as I know the only BT HS that works flawless i BH-903. N900 BT compability isnt that topnotch