I just purchased a 08 mazda3.
So far I love the car. Drives well handles great. What's not to like ??? However my volume will just go up or down on it own. It seems as if it's a amplifier issue. The radio is 100% factory stock . Any suggestions ???

 

Check your owners manual.
There is an automatic volume function that increases the volume when you are traveling over 50mph, IIRC. It is user adjustable and defeatable through the function/control ****.

Mine is set on #1 and I have found that to work best for me. But I know others that the function bothers and they defeat it all together.

 

THANKS x 100000 .... That fixed my prob !!!!! You ROCK !!!!! Thanks man

 

(If only they were all that easy.... )