Originally Posted by Rogerschro
Had you been in a hurry it probably would have stayed in gear. I'd bet the computer got confused about shifting, it was ready to shift gears when you slowed down and it got caught between gears for a moment. The TSB probably addresses some of that but there will be times when input conflicts with output. Think of it as putting in the clutch to change gears then changing your mind as you apply and let off gas. Revs will happen!
I updated my post to reflect a previous incident that occurred before this one.