I don't know the timelines, but at some point they upgraded the rails from some kinda steel to CrMo, which is stronger. I've never had such a rail problem, and my oldest one pre-dates the advent of CrMo. Now I use the carbon rails.

Also, you can send your broken one to S-A and have them replace it. Several things could have broken it.

Too heavy rider
Not lifting your weight off the saddle for big bumps
Saddle positioned with end of seatpost clamp at the bent end of the straight rail mounting area
Seatpost clamp area too short - 20 mm versus 30 or 40 mm.
Seatpost setback inadequate for good saddle mounting

Some of this is SA's fault. Some of it is our fault. By changing the rail material to CrMo they have taken a step in the right direction.

I'm not saying it's your fault. Maybe I'd draw a clear conclusion if you showed some pictures of how your SA is or was installed, but as it is the best I can do is talk about the generalities, some of which are obvious.