I have three laying hens. Two of them have been laying in the nest boxes for about two months. The third just started laying about two weeks ago and she lays them everywhere but the nest boxes. Today I found one on the ramp from the coop to run! The worst part is the last few days the other two stopped laying in the boxes and are laying on the floor. The boxes are exactly the same as they were when they were using them. What should I do?