2021 LEXUS RX Engine Problems

I am writing to you regarding the vehicle safety which I became aware of  recently but there was no solution provided. IF this happened to me, it can happen to anyone driving the same model and needs to be addressed as soon as possible before the fatality occurs as this is danger to the public.I was driving a vehicle on [XXX] after just picking it up from service (serviced at Ray Catena Lexus on [XXX] for 15,000 miles service and oil change) at the rate of speed approximately 65 mph. All of sudden the vehicle started making noises, transmission shifted from auto to lower manual gear and I was barely able to keep control of the vehicle. Luckily, I was able to pull over safely, turned it off, gave it some break and turned back on. Vehicle seemed to be operational and since I was close to the AmTrak train in Washington DC, I have decided...

My car has 171,000 miles on it and I have a blown head gasket. This vehicle has only been driven by myself and was purchased brand new.