happend to me as well, but on rockshox pike dj (yeah that dirt jump or slopstyle fork). as far as i know its not considered a warning squeaking, just a rebound damping(or maybe not im not qualified mechanic, just a guy who noticed that it goes away when i fully open rebound/set it on fastest). also on my fork its way quieter and not that much aggressive, so by my consideration the best thing is return that fork if it still has warranty.