Welcome to the forums. Fingers crossed that it's the
sensor. As scen1c says - it's a common fault and pretty cheap to fix. Sounds like you've been a bit unlucky. Have you considered a third party warranty & maintenance plan. I know it's like closing the stable door when the horse has already bolted, but it might be worth considering? Also - forget main dealers and garages. You'd get just as good, if not better, service at a local independent. Where abouts are you? Maybe someone can recommend a garage to you?