Well, the reason I ask about it being on or off is because this happened to me and I had no idea why. Then I read in the owners manual that while the engine is on, it uses the hydraulic brakes and while off, it uses the electromechanical brake for the rear wheels only. I'm figuring it was just like when you engage the handbrake in an auto-tranny car with your foot-brake on. Then release the foot-brake and there is a small lurch or roll.

The voice command thing, honestly, I'd say ask the dealer if you're up to date with your software. Mine works very very well. Almost too well. I don't talk loud or direct, I just talk as if I was talking to no one like a crazy person. Seems to work fine.

Good luck, keep us updated.

PS: How do you like the 4.8? I came from a 2005 3.0i and holy night and day difference, batman. Now I want a new 5.0 because I hear those are even more insane than our 4.8's.