How to fix an unresponsive touchscreen in the Audi A5?

I've been experiencing issues with the touchscreen in my Audi A5. It's been completely unresponsive and I can't access any of the features. How can I fix this issue?

First, try restarting the car's infotainment system. If that doesn't work, make sure that the touchscreen is clean and free of any obstructions. If the issue persists, it could be a software or hardware problem, and you may need to take it to a mechanic for further assistance.