If you think, your Lexus has a serious defect that affects the safety of the vehicle, report it to the Lexus Dealer immediately. If you’re not happy with how the Lexus Dealer is dealing with your report, in the UK you should contact the Driver and Vehicle Standards Agency (DVSA).
But before that, you can describe the fault of your Lexus in our forum. Maybe some other Lexus owner will learn that he experienced the same issue. Multiple occurrences of identical defects mean a better chance of success in a complaint filed with the DVSA. Our website is visited by Lexus owners from all over the world.