The car is a 2002 Audi A3 1800 T sport auto. The car drives normally and then suddenly the traction control light comes on. The car then loses power and bangs loudly as though it has just driven over a very deep pothole, the revs fluctuate and the car occasionally stalls. It is impossible to drive the car until the ignition has been switched off and the engine restarted, which resets the system. Then the car will be ok until the next time it happens (which may be an hour or a day). Scanning the car showed the following fault codes -

Engine - po102 - mass airflow sensor
EPC - 01166 - engine torque signal
EPC - 01045 - tiptronic switch

It is my daughter's car and she needs the car for daily commuting. If the fault occurs in heavy traffic it is difficult and dangerous for her to drive and it is not easy to pullover, switch off and restart the engine. I would appreciate any suggestions for a cure.
Thanks.