I have 5 BRs Over the past several months I Have found a dozen leather egg shells all over the yard and in the coop. One was in the water dish with the yolk and white in the water and the leather shell on the ground. It had to be laid while roosting. I have averaged 4 eggs a day and have had 5 only 6 times. I know which one it is and she appears healthy. Has anyone seen this before and what can fix it?