2004 Infiniti G35 electrical system problems

Was maneuvering a gentle right hand curve on a 4 lane city street. The car just simply died. Without the engine running the power steering was nullified and the vehicle wanted to continue in a straight line. Approximately 200 ft. Ahead there was an area with a driveway belonging to the water dept. Which I was able to wrestle the vehicle onto, out of traffic. The car would not restart and aaa was called.

I bought my 2004 infiniti g35 in jan 2009 it had about 135000 miles. About a month later my CD player said check CD. The radio and cassette player works fine. I tried new cds and clean the CD player but still didn't work. I call infiniti they said I may have to get a refurbished unit. I told them that the CD player should last longer than 5 years and that I had a 96 pontiac unit that still work. A week later I tried it and it was working fine until about a month ago it stop working and it still not working.