I have 5 hens (2 wyandotte cross austrolorp and 3 Isa Browns (production reds) My girls free range 3 hours in the afternoon and have shell grit and high quality layer pellets available. If I am providing everything I can, could this just be an old age thing ? I was getting 4 eggs a day. Then last week it dropped to 3 a. day NOW 8days later I have 4 and one is soft. I have read the other threads but Any Ideas?