My rear backup camera was faulty when I first bought my car. It would gray out or be fuzzy but only intermittently. Infiniti dealership said the same thing, they wouldn't repair it unless they saw it happen. So the next time it happened, I took videos with my phone and emailed them to the dealership. Again, they said to bring it back in, they have to see it happen before they would take care of it. I brought it in, and of course it didn't happen. However, my service writer went to get a mechanic and sat him in my car. I made sure he stayed with me until it happened. They said they had not seen this problem in this vehicle, but the camera was faulty and was replaced. I have a wonderful dealership and go to the same service writer each time. They took very good care of me.