I am having a problem with my 2012 Honda Civic EX Sedan... when I am driving, and remaining at the same speed, my volume constantly goes up and down. I have brought it in several times, and had them replace my whole stereo system, and it is still happening. I know when you drive faster its suppose to get louder, but this isn't the problem. I am set on cruise, and my volume is constantly going up and down. Has anyone else had this problem?! I am getting so frustrated and need some answers.