I want to be clear that all hens can have reproductive issues, even ones from heritage lines/good reputable breeders, however, with hatchery stock, you can almost guarantee you will experience that in your flock. Good heritage lines seem far less prone to it and even the hatchery birds who are not the most common egg laying breeds folks get on chick days are better choices if you want to avoid those issues. At least, that is my personal take on it from my own experience so far.