Reg radio, cd, xm, pandora and most pronounced on ipod/usb. I have the car set to lowest vol when turned on so I have to go a great distance to turn it back up to audible levels. Pressing vol up is a waste of time vs turning the knob.
This may be a bad switch in the steering wheel. That's not normal. If you're under your B2B warranty I'd take it in and demonstrate this to your service advisor. Since your car works both normally and abnormally try to demonstrate the difference.
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