Yeah I remember Dale was looking for one a while back, that's why I asked if he ever found a solution, ha! Mines just starting to do it, I've only noticed a couple times so far but figured the switch was getting bad. 166k miles.Weird. I'd look for some of the wiring being misrouted and rubbing against the steering column shaft.
Edit: I guess that alternately it could be a badly worn multi-function switch that is failing. Of course, the 2003 switch is different than all the other years (AFAIK), and very hard to obtain anymore.