I Had A Very Similar Problem Go Through My Hens I Had To Contact The Dept Of Agri. In Harrisburg I Was Losing 2 Hens A Week . It Was Fowl Cholera. He Said When They Hide In Corners Or Shovels That A Huge Sign I Had To Put The Whole Flock On Duramycin 10 Otherwise Id Lose Them All . Hope This Helps Good Luck