Just a brief note. Re: your specific problem, I feel a little bit related, with differences. Since you don't mention any other problems, I'd would second the idea of the flashers. However, when my '03 started kicking off the cruise control when I signaled for a turn, and then the cruise wouldn't cancel when I tapped the brake, I had to look further. Fortunately, the area behind the dash directly in front of my "navigator" turned up two different blown blade fuses. Problems solved. Moral: Check all those fuses while you've got the panel off.
Jim E. '03 FDTS, 38' w/Cummins 350