My three 1-1/2 year old bantams have not produced an egg in two weeks. This is a first. The girls appear to be happy and healthy. In the past I would let them out of the coop early in the morning and they would free range all day and only return to the nesting box to lay an egg the back out they would go. Of course, every evening they return, have treats and I close the coop until the next day. Now..... They leave the coop only for brief periods during the day, take a dust bath, eat a few bugs then head back to the nesting box. Our rooster has become very possessive and tries to keep them in the coop. Any thoughts?