I got a perculiar problem also.
There is a delay & slurr when auto changing from 2nd to 3rd. It seems to go to a neutral state before engaging into 3rd. At that moment, it will rev up.
It's been like this since I bought the car a few years ago. But other then that, nothing wrong with performance, except during cold, the gearchange is a bit violent..maybe time to change box? Btw, my autobox is a JATCO 5 sp. 180K km now...