This morning I was in the coop collecting eggs and I had 3 soft shell eggs. I have been getting between 10 and 15 eggs a day from my girls with no problems for about a month after a slow winter. They seem fine, eating, drinking and pooping ok. Could it be the stress from the roosters? Should I be worried? They get a good layer food (I did change brands about a week ago) and free choice osyter shell plus they free range all day.