this is a Ford F150 2019, 3.5 L, 10 speed transmission, while driving on a highway, the vehicle was on the 10th gear with a speed of around 70 Miles per hour and suddenly shifted to the first gear with a sudden drop in speed, that have caused me to almost go through the windshield, and the vehicle behind me almost rear ended me, I spoke to the dealer and they advised me not to drive it due to safety concerns that has been reported to them on multiple occasions, and after I gave then the VIN they stated it has not be recalled yet, I took it to the dealer and after 2 months of back and forth with the Ford dealer and Ford motor company, the problem was the transmission and it is in the process for it to be replaced. prior to this incident, the shifting gear was bouncing between gears and lagging for few weeks prior.