Automatic Transmission problems of the 2008 BMW 5 Series

My 2008 BMW 528i has now shifted into neutral, and then down-shifted, at high speed (60mph) without warning 4 times. Three of these incidents occurred on the freeways of los angeles. This latest incident almost caused me to be hit by multiple cars as I coasted to a gorepoint at a freeway offramp.

Transmission locked in parked and vehicle blocking moving truck. Unable to tow auto because dealership was unable to provide assistance for unlocking mechanism. Necessary to contact BMW directly for assistance to unlock transmission and vehicle subsequent towed to dealership.

When engine is cold, car will not shift into reverse. It must be shifted into drive before it will shift into reverse. The first time this happened was in August-September 2007. The gear shift was replaced by the dealer. It happened again in October or November, 2008. The dealer downloaded all the software related to gear shifting and re-loaded it. The shift worked about one month until it happened again. As soon as I can get the car back to the dealer, they will have a third opportunity to fix the same problem.