Air bag error warning

I have just bought a January 2013 Superb Estate 4x4 DSG and have been having issues since. My current issue is the warning light for air bags illuminating, braking lightly at a roundabout the air bag warning light came on for the first time, the car went back to the dealer who said a spool on the passenger airbag had shorted out and replaced it. About 5 days later again braking lightly as I reversed into my drive at home it lit again and an error message reads on start up on the dash board. It is almost as if the steering wheel is in a certain position slightly turned, moving slowly and breaking causes a problem.

Is this a common problem and if so any thoughts on resolution?