Known bug, it's on the internal bug list. Put it there myself. I think the DSP mute is opposite-toggled for some strange reason.

Not fixed yet, as far as I know.

Work around: Set your standby timeout to a very short time so that the player fully shuts down quickly after you turn off the ignition. Then the next time you start the car, the player will fully boot instead of waking up from standby mode.

Didn't know the trick about pounding on the pause button, I'll add that to the bug report now, thanks.