Power Steering Failed problems of the 2014 Audi A4

The steering locks up out of no were while driving making it seem like power steering failure and gives you a stuck then let go feeling. I'm a mechanic and have come to find out the steering universal joints seized and rusted bad making it well not steer smooth it's very dangerous and a car only 6 years old with 80000 mile should not have an issue like that but it's very very common after research.

Tl- the contact owns a 2014 Audi A4. The contact stated that while driving at various speeds the power steering would suddenly fail. During the failure the message "steering defective do not drive" would display. The vehicle was taken to an independent mechanic who unable to determine to cause of the failure. The manufacturer was notified of the failure, the local dealer was not. The failure mileage was 20,000. Jft.