The problem is especially frequent among TSI owners with 1.4 TSI. The low quality of the fuel and the complex operating conditions may result in mechanical damage to the turbocharger's transfer valve or to the problems with the electromagnetic pressure control valve. There are also problems with the electronic control unit.
In either case, you must contact the service to find and correct the problem. The replacement of the candles, the ignition plugs, the washing of the fuel system are most often not helpful.