When I started professionally in the middle 70s, almost everything was fading in just a few years. Typical Kodak garbage. Kodak sold everyone on color, and how stable it was. NOT. The only color prints that I've seen from the 50s and 60s that were stable were B&W hand colored.
I don't know if it was because it was RC or not. I didn't use the satin finish on my prints and I used a professional lab. It was just Kodak constantly changing the chemistry and paper for what ever reason.