How do I reset the MMI (Multi-Media Interface) on an Audi A4?

My MMI screen on my Audi A4 has frozen and I can't access any of the menus. How do I reset it to fix the issue?

To reset the MMI, hold down the Menu, Nav, and Info buttons simultaneously for 10 seconds. After that, restart the car and the MMI should restart normally.

Another option is to disconnect the car's battery for a few minutes, then reconnect it. This will often reset the MMI and fix any frozen screens.