Within the last week my wipers went from working only at slow speed, no matter what position the switch was in, to now only moving about 4 inches before stopping completely. I've seen a lot of different issues with wipers with the control panel and motor. My guess is I'm going to have to end up replacing the wiper motor. Ultimately if this is such a big issue for so many, what causes it and how can it be prevented? I've never had issues with a wiper motor before on any of my vehicles. It's a 2011 Sierra. Any input is appreciated, thanks.