My 26 month old Rhode Island red was dead yesterday. She had shown symptoms of lethargy for the past two days. Last week, the other bird her age, a Leghorn , showed the same odd symptoms. Tired , not real interested in eating scratch with the other chickens,. I was keeping a close eye on her, but suddenly she recovered. The red bird then started acting sick. I know for certain the Leghorn is molting, and hadnt laid in several weeks. Im not sure if the red bird that died has laid lately. I have 8 other hens, showing no signs of anything wrong as well as a few pullets and chicks that seem OK. I am out west and we have not had hot weather lately, actually pretty cold here. It just occurred to me that if these birds are not laying, perhaps they should not be eating layena, with calcium added? could that be that is happening? Sorry I didn't really notice any other symptoms, yet.