Wiper problems of the 2013 Lincoln Navigator

I have a 2013 Lincoln Navigator that has some serious problems with it¿s rain sensing wipers. They will stop completely during a rain or rain/snow storm. Other times they won¿t come on by themselves. They instead have to be turned on manually. They have come on and stayed on for at least two minutes when there has been absolutely no rain or moisture in the air. I am sure you will agree with me that this can prove to be a very dangerous situation. We also have documentation on the dealer¿s work orders showing the times we had brought our vehicle in for the problems. We have pictures proving our problem but these pictures have been completely ignored by both the Lincoln reps themselves and the dealer¿s service department that we purchased our vehicle from new last may ¿ williams auto group in sayre, PA. From their tests the wipers ¿work as they were designed to�. I am going through the PA lemon law now but I was just curious if there had been other vehicle owners, Ford or Lincoln, that have reported the same or similar problem. What makes this very troublesome is both the company's and the williams group ignoring our proof -- the pictures. Previously we were having problems with our tailgate opening while driving the vehicle, outside mirrors moving on their own, drivers seat adjusting on its own and the key lock not operating as it should. Even though none of these were able to be reconstructed at the dealership, there were 3 instances where these were witnessed by the dealer's service employees. So they did go ahead and replace many of the modules but have done nothing with the wipers.