I have a 2020 chevy custom 6 speed transmission. Its in the shop now for the same problems you all have described. They are replacing the torque converter. Been there 7 days. Lemon law says once its been in the shop over 30 consecutive or non consecutive days in the first 24 months i can claim its a lemon. Im counting the days and will be adding them together everytime i have to take it in. Only had it 7 months so far. Bought brand new.