One problem related to adaptive cruise control has been reported for the 2021 Audi Q5. The most recently reported issues are listed below.
When using cruise control, the vehicle suddenly brakes. If set a 70mph it will jam on the brakes and reset to 45 mph. This has caused near rear collisions. This is a recurring problem,. Audi service tried 3 times to identify the problem. Google has other owners with the same problem.