Does anyone else hear a high frequency sound at low speeds, like a motor whining? This sound is at speeds, less than 45 mph. It happens at acceleration and deceleration and seems louder on cold mornings but it's always there. I've had this since purchasing the car. The mobile tech said he couldn't hear it or maybe it is the pedestrian warning. It seems to be getting louder now that the car is about 15 months old.