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The Tesla technician studied the record of my car and concluded there was nothing wrong with the car and that I must have been having a foot on the brake at the same time as a foot (or the same one) on the accelerator. It must have been caused by my using my left foot on the brake which I do occasionally. I felt greatly relieved although a bit stupid. I am still amazed that every service center I have used over 61,00o miles must think I am Elon Musk's older brother since they treat me so nicely.