One problem related to transmission failure has been reported for the 2009 BMW M3. The most recently reported issues are listed below.
Slowing down at an intersection to make a left turn. Decelerated to about 3 mph. Accelerated to initiate the turn. Transmission failed and car did not accelerate. About 1. 5-2 second lag time before the transmission actually engaged. Almost got hit by an oncoming car.