2003 Audi A6 3rd Gear slams into gear

I had the torgue converter replaced and transmission rebuilt approx. 3k miles ago. When I got the car back, the transmission shifts smoothly in all gears except 3rd. The car kicks hard into 3rd gear no matter how much pressure I apply to the gas pedal. The car downshifts through all gears fine. The transmission specialist informed me to drive it for awhile as it may be due to the "adaptive" tranny. As it hasn't improved, I recently had him test drive the car and he explained that he would need to drive it hooked up to his diagnostic computer in order to diagnose the issue. He did this and has still not determined the cause. Thoughts?