OK. So I've had four chickens for about 8-9 months now and everything has been going fine. Lately they are not returning to the coop at night, and instead are sleeping and pooping in places I don't want them to (like the deck, my work bench, etc). They do return to lay their eggs, but don't seem to want to sleep their anymore. What gives? It has to be warmer in the coop than on the railing of the deck. I can physically put them in the coop at night, and they will stay there until morning, but they used to be soo good about doing this on their own. What gives?