I was driving the Burban home from Denver to Amarillo this morning and ran into a nice down pour in New Mexico. I turned on the wipers and they were fine, then they started to stutter while they were wiping. It seemed as thought the stutter was consistent through the entire wiping motion. Once I got through the storm I turned them off for a while and checked them periodically to see if they were still acting up. It took about 20 minutes before the wipers worked normally. This seems to be an intermittent problem as this was the first time I have seen this but my wife said it has done the same thing to her a couple of times. Any thoughts on a cause? I am afraid if I go in blind to the dealer they are just going to tell me they cannot reproduce the problem.