Going to send my car to audi to have it looked at tomorrow. The front left side wheel is making some loud humming noise. The noise is only audible while at high-ish speeds on the motorway going straight, and it's only from the front left side. It will only happen after driving for a while, so could it be heat related? Could it be a wheel bearing issue or even a hub issue? Anyone with similar experience? I've only got 12k miles on the car. Dont think it's a tyre issue as the tyre seems to be wearing nicely, and it's only coming from one side.