We have 3 RIR's (all about 3 yrs old) and one of them has been laying soft or weak shelled eggs over the last year. They're free range for most of the day and have full access to their food and plenty of water. It's very sporadic and we've only caught one of them in the act of laying an egg. After quite a while laying, her egg burst (outside of her and onto the wall). I read on a thread about calcium and purchased Rep-Cal but am now considering just adding their oystershell into their layer pellet. Then, I read on another thread that if it's just one of the hens---it's a genetic issue. But we don't know for sure that it's only Whitey with this problem. If it IS a genetic issue, there's no reason to consider adding calcium right? As they're not pullets just getting their lay on, I wonder if it's stress. We just lost the deal on buying our house and maybe they heard about it? Hoping someone will tell me that it's just a 3yo phase and to just watch and wait. I will mix the oyster shell into the layer pellets, anyway.