2019 new freightliner cascadia automatic D12 transmission issues

I'm driving a 2019 New cascadia 126 with the D12 transmission. When ever I go over a tiny bump or a larger one my dash digital display lights up red and says" transmission can not shift" and the engine light comes on on the left and the gear symbol on the right. Then a blue screen lights up and says " starter is blocked, shift into neutral ". After a few seconds they both go away. Wile it wont shift it seams to go into neutral. This happened while I was descending down a 6% grade yesterday with 45 mph turns. It's in the shop right now and they said they cant get it to duplicate the problem and if they cant they have to release my truck. Problem is I'm in Washington state a1000 miles away from my home terminal in Saltlake city Utah. Many mountain passes ,hills ect. Please help. Anyone have an idea what the problem could be or what I should do? Thank you.. btw this happens often .