hi im a newbie on here.i have a 55 plate x5 3.0 diesel with a intermittent problem. when starting sometimes I notice the screen stays on settings,also the radio does not work know does wipers and all interior lights stay on,and sometimes trans com failure lights up on dash.if I turn engine off and lock doors a couple of times it all goes back to normal.the car has done 167000 but had a total engine rebuild auto gearbox rebuid and new torque converter 5000 miles ago by previous owner.it looks and drives like brand new.also airbag light stays on.i have had brand new extra powerfull battery put on,thats when I think airbag light came on.[battery supplied by bennetts] can anyone help.thank you