With a nod to all of the above posts, my F56 has had the same symptoms twice 7000 miles apart with the added feature of it not shifting out of 1st gear while driving.I had it happen to me right before Christmas. Just when I was about to give up and call roadside assistance, my husband decided to give it a try and of course it worked. I feel bad about saying I'm glad it happened to you, but it may now cut down on the number of jokes around here about my hair colour! Was you your car parked on any kind of a slope at all? Because that can apparently lock you transmission up. Jostling the car a little can unstick things. At least that was the explanation I was given.