A dead trigger on a pistol designated to carry is not only concerning it is unacceptable.
I've had two occasions in 10,000 rounds or so on my Glock 19 GEN 3 where I've performed a reload and gotten a dead trigger (trigger in the forward position appearing to be reset but when pressed it just falls to the rear not engaging the striker).
While performing a reload during dry fire today and turning the pistol inboard to rack the slide, if I rack too hard I am able to replicate this problem. Has anyone heard of this happening before?