Why is my Audi A5's touchscreen not working?

My Audi A5's touchscreen suddenly stopped responding to touch. I have tried restarting the car and checking the settings, but it still won't work. What could be the issue and how can I fix it?

First, check if the touchscreen is enabled in the settings. If it is, try cleaning the screen and your fingers, sometimes dirt or grease can interfere with the touch sensitivity. If that doesn't work, try rebooting the car's infotainment system by holding down the power button for 10 seconds. If the issue persists, it could be a hardware problem and you may need to take it to a professional.