back up camera

I have a 2014 Outback - the camera worked well for about 2 years then it
began to cut out {no image} blank screen. All other uses of the screen were
fine. The blank screen occurred more often over time and damp conditions.
Even humidity affected it. I have my car Ziebarted every year it seemed the
camera of what I could had rust on it. By the third year i asked the dealership
and the cost to replace was almost 400 dollars!!
Is this a common problem? Is subaru making better cameras?