We have 5 hens. Just about 7 months old. 4 have not starting laying at all. The 5th has been laying for about 3 weeks and stopped this past weekend and has not restarted. They get pellet layer, water, and cracked corn treat everyday. They hae also started sleeping on their nest boxes and not the pearches. Any ideas why they are not all laying? Chickens are so......difficult to figure out!