So freakin frustrating. There is obviously a problem here, and Toyota/Lexus is refusing to acknowledge it! While driving on vacation, my "check hybrid system" light came on, as well as the "VSC" light and check engine light. Shortly thereafter, lost power, and had to coast off of the freeway, which was super sketchy. Was able to restart the car and go a little farther before it shut off again. Finally figured out it was the coolant of the hybrid system, as the engine was at a good temp. Obviously leaking from somewhere, found it to be the inverter.