550 wipers and function (or lack there of)

Question for the forum. Was out driving yesterday morning and got stuck in the rain in the 550. No big deal, except for the fact that my wipers failed to work. At first, only the delayed mode was not working, but both low and high continous modes were working fine. As I started switching between settings using the steering stalk, I lost the low continous and then also the high continous modes. I hear a sound as I switch indicating there is some response from the stalk. No more wipers for the rest of the 20 min drive home on the highway. Got home, and played with the stalk, switching the wipers on and off and every 10th time or so of trying I was able to cause the wipers to fire on the high continous mode. Also, the washer mode doesnt fire the windshield washers or the wipers. Has anyone else encountered this problem? It doesnt seem like a fuse probelem (which I assume would be all or none) or a wiper motor problem. I figured it might be a faulty switch in the stalk. Any input would be greatly appreciated.

Thanks. Omar