Why is the steering wheel on my Audi A4 vibrating when I drive above 60mph?

I recently noticed that my steering wheel starts to vibrate when I drive at high speeds on the highway. It doesn't happen all the time, but it's becoming more frequent. What could be causing this issue and how can I fix it?

It is likely that your tires are not balanced properly. Vibrations can occur when the weight of the tires is not evenly distributed. Take your car to a mechanic and have them check the balance of your tires.