Ours is dong the exact same thing. Took it to a paint shop and they indicated that it's the clear coat that is coming off due to the UV rays from the sun. Our coach is parked all year at two different places. During the winter months it's at home and is facing west so that the curved area on the roof/side joint area is facing the south for six months. During the summer months, it's facing south and the same area on the front of the coach is peeling.
We will have the damage area repainted and will keep the mh in our new rv garage while parked at home....but not much I can do about the summer months.
Ron
