Presumably you already tried the transmission reset to allow the transmission to "relearn" your driving behavior, and this didn't correct it? If not, turn you car on (but don't start it), and depress the gas pedal all the way down (past the kick point) and hold it down for 45-60seconds. Then start the car normally.
Also, I had some irregular shifting on my '07 auto and the dealer checked it for me this week. They found that the mechatronics sleeve was leaking and the fluid was a little low. They replaced it for me and covered in under CPO. Not sure if this is "mechanical" versus seals/gaskets, but it was covered.
'07 650i vert, creme beige/jet black, sports & cold weather pkgs, comfort access, premium sound, sat radio, Miro M6 wheels, tint, windscreen, triple resonator delete, 5W bulbs, corner bulb delete and m-tec fogs
'11 Acura MDX Advance with Entertainment pkg for the family - no mod's