Some players get injured a lot and thus go from being All-Stars to awful very quickly.
But what about the guys who don't get injured? What's their excuse?
The world of sports can be a cruel world, and there's no room for inconsistency. As an athlete, you can either maintain your highest level of excellence, or you can get cut. That's pretty much how it works. Mediocrity isn't an option.
Nobody said it was fair, but that's the reality. The guys who suddenly flame out for no apparent reason may just be simply unlucky. Or maybe the height of their excellence was just a fluke.
It's still annoying, though, when they decide to lose their mojos after you sign them to multiyear, multi-million contracts.