Bluetooth not always hanging up

[Turbo_Bimmer]

I searched without succes, so...
My Motorola KRZR is working fine in the X, transfers address book etc.
The only bug I have is, if I terminates a call without having connected.

Lets say after 5 rings, I decide to hang up at the steering wheel button, my phone will hang up, but the green led will stay ON on the NAV, like if it is still online. I tried to press several times the button to hang up, on the steering wheel, or on the NAV without success.

If I turn OFF the X5 and leave for the night, the next morning the batterie is dead from the bluetooth module being transmitting all that time.

To avoid that problem, I have to turn OFF my phone and ON again.This resets the bluetooth.

Is there something I have to set in my phone (don't think since it hangs up fine) or in the NAV settings?

Any ideas??

Thanks.