My c43 from 2019 with only 60k km has begun to act strange. It all started about a week ago when the fan would suddently keep going after i shut down the car. This is something it never did before. I can also see on the turbo gauge that the boost keeps fluctuating a lot when im just driving normally. It actually seems to start at around 60-80 km/h. You can even feel the car starts to "jerk" while this happens. Any ideas what may cause this?