Kenworth 2022 t680 auto transmission issue

Hello everyone
Recently my kenworth 2022 t680 started having an issue with the transmission the truck has only 170k miles. It mostly happened when I was going uphill when I downshifted from 12th gear in manual mode message popped up saying “stop driving or damage will accrue to the transmission” and same thing happened today when I tried to up shift from 11th gear in manual mode both times I had to pull of to the side turn off the truck and turn it back to and goes back to normal like nothing happened I do plan to take to the dealer but in the meantime anybody had this issue or something similar
Thank you.