I have 3 hens who won't leave the nesting boxes as of a week ago. Two of them are actually in the boxes (there are 8 nesting boxes) and the other hen sits on the nesting box roost acting like she's guarding the other two. None of them are laying, AND I have no eggs from the other 10 or so hens. Normally we get 10-12 eggs every day. What the heck is going on?