We had our 2nd travel trailer for 8 years. About the 4th year I noticed the graphics starting to age. I think I used the wrong wax on them, pretty much my own fault, which accelerated the aging process. I never did do anything with the graphics. When we traded, the graphics added no extra value one way or the other. They were peeling and chipping and curling, and starting to look really, really aged. I figured (in the 4th year) the cost of replacing them was not worth it. I never did find a way to stop the aging on them. Resale at trade time, we got a pretty good (very acceptable) offer on it (we were very content with the offer).
More than likely, your graphics are starting to fail. There isn't much you can do to stop the process. It's already started. Face it, everything dies! Even graphics!