My chickens (26 hens and 1 rooster) have been laying really well the last couple months but the last two times I went to the coop to collect eggs there as been one broken one within the other eggs. It isn't just pecked once, but completely broken and some of it appears to be missing. The only thing I have changed is I hung a light in the coop on a timer to extend the day so they are in the coop with light a little longer than usually until I wake up to let them out. Could them being "cooped up" too long in the fake light make them get bored and brake the eggs? I have read that once they start doing this it's hard to brake them off it. I have supplied them with nine nesting sites, but it seems like they always lay in the same two spots, so there will be at times 6 eggs all in the same nest and none in the others. Any advice would be helpful. Thanks!