No Audio, No Input

In the middle of my first race, suddenly the music cut out and the game stopped responding to button presses on either my Xbone controller or the keyboard. The car continued to coast along until eventually slowing for a stop, and the HUD continued to update, so the game didn't crash per se. Closed the game and restarted, same deal. Can't even hit spacebar to get to the main menu.

I'm normally pretty good at troubleshooting games, but this is a new one. Help?