Wiper problems of the 2008 Jeep Patriot

The front windshield wipers randomly stop working while it is raining out. This first started about a month ago. Sometimes they are fine for twenty minutes, other times it is 5 minutes. They will completely stop working and fold back down, as if I have turned them off. It has been taken to sears once, and spent two days at the Jeep dealership and they were not able to recreate it. I think it needs to be driven on the highway and raining for it to happen, maybe the force of the wind or road is the cause. No one can seem to figure it out and they do not have the technical skill to recreate it, I was told that nothing can be done and to bring it back when it happens . All the computers read that the wipers are fine, yet this keeps happening. Not being able to use wipers for even seconds is dangerous, and I am scared to drive now when it rains. I have recorded video on my cellphone of it happening, and still it is no use because they can not recreate it. This is a very stressful and frustrating situation, that could cost me my life if not addressed.