hard time shifitng in 1,2,3 gears on 2004 Audi TT

I have a 04 Audi TT with 60,000 miles. Serviced regularly. There's an issue shifting from 1st , 2nd and 3rd. Sometimes falls back a gear. My car is an automatic. Took it to my mechanic Audi specialist, he hooked it up to the computer, it read NO ISSUES....there's a big freakin issue here. Help, before I get another whiplash and leave my tranny in the middle of the road!

Asked by for the 2004 Audi TT
First, what's the fluid look like? It IS NOT lifetime fluid. No such thing...

Clogged fliter causes erratic shifting as well.