Audi Has a Mind of Its Own
This bulletin applies to 2011 Audi A3 models. The radio may turn on and off, and the door locks may actuate during driving, and the clock in the radio may randomly not work.
The problem is likely sporadic disruption of S-contact due to lubricant on the contact surface. The S-contact is improved with a modified lubricant that has better electrical conductivity and improved viscosity.
The fix: Replace the ignition switch.