Ever since i got my 99 volvo s70 the radio has had some issues. When i plug my ipod into via fm transmitter from many different brands the volume continually changes. It goes loud then quiet and sounds like the treble and bass are al the way down. so is there any way to fix this?? And also sometimes when i put cd's in it reads error even though its a brand new cd. i have to put it in and take it out about 10 times then it works.