Agera RS engine and turbo sound bug

When Istart driving the car it sounds normal. Like this :

But after a while(some minutes), the turbos/supercharger starts to sound extremely loud(after 5-6k RPM) and the engine begins to fade at igh revs:

This but appears everytime I drive the Agera RS. It is really frustrating. The problem doesnt go away until I restart the game. I tried redownloading the game and it still keeps appearing.