boela

I bought the car about a year ago and at the time the seller told me that the esp/epc light comes on every now and then when starting up with loss of power. The fault was manageable as it happened once or twice a month.
Recently it became more frequent and at present is a full time fault. I have taken the vehicle to Audi "specialist" who cannot pinpoint the problem and has had the vehicle for three weeks now. Any suggestions on problem solving will be appreciated.