My girls have me concerned. They are 1 1/2 yrs old. 3 br, 1 bo, 1 light brahma, 2 ba. One of the ba has babies so she is fine. But the others seem to be having laying issues. They get in nest box daily, sit awhile then exit and sing the egg song. I run out to get the eggs excitedly only to find nothing. I have read ALOT here on byc and have to admit I am overwhelmed as to what could be our problem. I would love suggestions as to what I should do to help them. Otherwise they seem perfectly healthy. This is happening over a period of time. Started with 1 br, then bo. Just in the last 3 days, the brahma. I have been worrying about this terribly.