Bluetooth problems Centrino Advanced-N 6235

bOXDC3217IYE Barebone NUC

mSATA m4 - Solid state drive - 32 GB

4 GB DDR3-1600 PC3-12800

I have just put together this NUC and all is working fine except I cannot connect any of 3 iphones or ipad mini to the bluetooth.  The computer finds the phone gives a number, pairs up ok but then from the phone it will not connect say check blue tooth is on on the computer.  Any ideas would be much appreciated.

Thanks