I'm the only driver. Have never experienced this on the track. The jolt is pretty good. Would be the equivalent of side-stepping the clutch on a manual, it's not subtle it's a pretty good "bang."
I'll set up time with dealer. It's odd (but I'm happy that it's not more frequent) that it's what, one out of 12,000 shifts. You might think it would be software related but I'm not sure (no tunes of any kind on the vehicle).