Poison gnome

Hello, I urgently need your help. I have been driving my poison gnome for 3 months now a hyundai getz. He has first registration of 98 and has so far driven 35,000km, the previous owner has never had problems with the car, the car has been in the gerage so far. Now it is always outside. For three weeks I have the problem that I have now stayed 5x. It starts quite normally and each time the track was different long and sudden during the ride it makes a short ruc k and then the symbol lights up with the car with the key in it, then my steering becomes hard so that I can drive just to the right. It always takes longer until it starts again, but when it runs again it is like it never has been anything. I was after the third time at hyundai in the workshop nevertheless they could not find anything except on Maderspuren and it is also nothing tapped. Now I need you. Does anyone know the problem?