only have a handful of ducks that like to sleep in the chicken coop witht he other birds. they have always been pretty consistent egg layers until a couple weeks ago. they would make a nest below the chicken boxes and we'd collect everything at the same time, etc.. at first i thought they might have found a new spot, but i kept the pen closed for a few days and still found nothing. so i know they are not going anywhere else, they just plain stopped laying. they're only about 1 -1 1/2 yrs old. so anyone know whats going on?