If I turn the volume down to zero, and turn it back up. I have sound for about half a second, if I switch radio stations, or to CD/Aux same thing happens.

I'm completely stumped and need help.

The Stereo itself doesn't shut down either, it's like it mutes itself. I have no remote, and there is no mute option being pressed. Completely unsure of the issue.

Please help.
Oh, this only started happening today, after finishing some brake work, but I can't see a relation from the brakes to the stereo.