Do not know yet guys...
A couple of things. I did reset the transmission adaptations with INPA and that actually might have caused a slightly negative versus positive result. After 122K the valve body and other hardware is not the same as new, so who knows.
I've spent some time today doing diagnostics in INPA. Everything looks normal. All the solenoids activated normally, wires checked OK, pressure controllers fine.
I was afraid my torque converter was acting up, but driving with INPA monitoring the torque converter revealed no abnormalities. I mean I could see it turning ON and then OFF, so TCC clutch seems to function normally.
I replaced 5 quarts of Dex VI with Castrol Multi Vehicle ATF (advanced Dex III ATF) to change the viscosity of Dex VI but no change so far...
Will post an update when it happens. I also think that it
might be something different than my transmission, but what a coincidence!