I have 4 hens that I've raised from chicks for 3 years. They have always put themselves to bed at night. All of the sudden they won't lay their eggs in the coop.. they've gone under the porch the past 2 days. Tonight they weren't in the coop when I went to close the door. They were all over in the trees. They free range during the day but have ALWAYS gone inside for bed. Can anyone give me some insight on what's going on?!