NHTSA Complaint #11627417 — 2024 LEXUS TX

My Lexus TX 500h has an intermittent problem. It seems to have trouble shifting between 1st gear and second gear. Sometimes when I try to drive from a stop, the car will go a tiny bit and then feels like it switches into neutral instead of the next gear, leaving me stopped in the middle of traffic or an intersection. I have been stuck pulling out of my street onto a busy street with traffic bearing down on me. I have also started rolling backwards on a hill when my foot is on the gas and the car is in drive. It seems that the car puts itself into neutral vs second gear. I have taken it into the dealer twice for this and they “cant duplicate the problem” so tell me to go home and bring it back if it happens again. It keeps happening and it’s a huge safety issue. I’m not sure where I go from here.