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, beige/jet black, sports & cold weather pkgs, comfort access, logic 7, sat radio, Miro M6 wheels (with Michelin super sports), M6 spare tire, tint, windscreen, triple resonator delete, m-tec v3 AE's bulbs, corner bulb delete and m-tec fogs
'11 Acura MDX Advance with Entertainment pkg for wife - no mod's
'04 Acura TSX (daughter) and '12 VW GTI - Autobahn (son)