Sound bug (Construction Simulator 2015)

Hello everybody!
I have been observing this problem for a long time: after a while of the game, the volume of the sound of the engines, the sound of effects and much more suddenly increases. And the sound jumps - it is normal, then everything is loud. Restart the game - everything is fine. So many patches have already been released, and the bug has remained.
Steam license + all DLC. There are no mods.