This makes sense to me. (fiber ring network)
The Navi is fck'd up, it never turns off and now it won't eject the CD. I don't use the NAV feature because it sucks but I leave the map on just to see whats coming up. When the radio is on, the nav will randomly black out along with the radio. The nav used to black glitch out and not affect the radio, but now it totally blacks out and takes the radio with it, no static beeping or noise, just cuts out.