Radio volume
 

When going down the road, I set the volume on my radio to what I want, then I come to a stop and it turns itself down. I had the same thing in my Ford pickup but was able to turn that feature off. Is there a way to turn it off, I didn't see anything in my owners manual that said it was an option. I have a 2006 XC90 with the premium stereo (if that makes a difference).