6r80 tranmission acting weired after a track day

[OX1]

no codes at all! None on transmission, engine, or electrical.

but the car goes to limp mode (occasionally), i can feel a slip (occasionally).

FORSCAN also does live data. I have high end scanner, so don't use FORSCAN for that, but if it datalogs, drive around datalogging EVERY trans parameter. Either learn what they mean and what they should be, or send datalog to an expert that can evaluate it for you.