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I had the same issue on my 2002. I took it apart and cleaned it several times and that seems to "correct" the problem for a short period but it never really "resolved" it in the long term.
I finally gave up and just bought a 2 DIN Chinese Navigation unit w/ all the bells and whistles (they are way cheaper than name brand) and installed it.
Have had good success with it and now I use the iPod most of the time and rarely need the DVD/CD player.