My '05 with the 5 speed auto did something similar to me... once. It was only a few months old and has never happened again.

Same situation as you, waiting to turn left across traffic. Hit the gas at an open spot, not floored, but a fair amount of throttle. Mine lurched forward instantly and then just stopped going like I had let off the gas. After a second or two I did let off the gas and hit the brake because I wasn't in the traffic lane yet. Scared the **** out of me though!

I never did take it in for re-programming or anything, I chalked it up to the "learning" process the trans software has. Ever since that ONE time it has been fine.

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'05 X3 3.0i Alpine White/Gray Leather/Alum. Trim
Sport/Steptronic/Servotronic/Panoramic
Prem. Sound/Staggered 18" Style 114 Y-Spokes