Yeah on practically every car I've ever driven in Maine growing up. It's the salt and sand. Seems sorta fast for a 2017, but the winters are horrible, as you are no doubt aware, and it depends on what your town puts down too. Some towns use that brine solution, I have no idea what that does to cars long term, maybe it's better than rock salt? Or worse?
Another weird thing to wonder about is that perhaps everything stays wetter longer because the brakes don't normally heat up during use. Hard saying not knowing. Fact is, Maine winters have always eaten cars. Sorry. At least they're cheap parts....