I am new to chickens and started out with 6 chicks. All were healthy and thriving. The all started laying with in a few days of each other and laid well for about 2 weeks. Then one day, I found one dead on the floor of the coop. Then today, two weeks later, I found another one dead in their outside run. There is no sign of attack. Their outside run is fully enclosed (top, bottom and all sides and attaches directly to the coop, which is also very fortified) I am wondering about them being egg bound. Any thoughts?