Default buetooh problem

Hello everyone sorry if they are obtained, and sorry for my english.
I have no problem with bluetooh, and I think it is common nexus 4 with AOKP ROM,
I run the pairing with handsfree car and it works ok just as soon as I turn off the bluetooh
* on the phone asked me to restart the pairing if I leave it on always works.
Is there a solution?