My Kona Electric started making a buzzing sound, which becomes louder as I accelerate above 40 miles/hour. This buzzing sound is of lower pitch than the normal high-pitch sound of the electric motor. Because it doesn't make the buzzing sound when coasting, and doesn't change when turning, I assume it's in the drivetrain (electric motor, reduction gearing in the "transmission" or any linkage from motor to the wheels). My 2020 Kona was manufactured in late 2019 (Q4); the odometer is around 7400 miles; and recalls (including the brake recall) have been performed. Other than ear plugs, has anyone with this problem found a solution? Did Hyundai change the electric motor design (or mounting or transmission reduction gearing or linkage) between the 2020 and 2021 years?