As an FYI, this just happened to one of our approx. 10-month old Easter Eggers. She was the first to begin laying in late January, all of her eggs being "perfect" and big, and then she didn't lay two days in a row (skipping a day about every 6-7 days has been avg. for her), and I went into the coop to see if maybe she laid them somewhere else, and I found one cracked soft-shelled egg on the poop board, and another soft-shelled, uncracked, also on the poop board - looked like an old, deflating balloon. Next day (yesterday), she laid just fine. So, I can only speculate. The food, calcium, and snacks seem to be appropriate. She is, however, the most skittish of the three hens, so maybe something had spooked her that I'm unaware of. At any rate, just keeping this thread alive with my experience.