If you think, your Subaru has a serious defect that affects the safety of the vehicle, report it to the Subaru Dealer immediately. If you’re not happy with how the Subaru Dealer is dealing with your report, in the UK you should contact the Driver and Vehicle Standards Agency (DVSA).
But before that, you can describe the fault of your Subaru in our forum. Maybe some other Subaru owner will learn that he experienced the same issue. Multiple occurrences of identical defects mean a better chance of success in a complaint filed with the DVSA. Our website is visited by Subaru owners from all over the world.