We have had 5 hens since 5/2011, got 3hens/1 rooster 5/2012. They are in seperate pens. We found my favorite year old hen dead today laying in her nesting box with a half layed egg. We are pretty new to this, so her death was unexpected. We haven't changed her food (gets 1/3 mix of flockraiser/layena/cracked corn). It has been very hot (heat index 100-108) over several days but we have been misting them with the hose every day. What can I do to prevent this from happenening to the rest of my flock? Any help would be greatly appreciated. Thanks!