Ok i am a new chicken owner and have lost 3 chickens in2 weeks. the chickens are about 6 months old. they are white rocks and new hampshire reds. they sleep in a pile at night. the first chicken was really sleepy for a few days before it died. other than the sleepiness there was no sign of illness. these two chickens we lost today seem to be the chickens that were sleeping on the bottom of the pile last night. they eat hilands natural non gmo feed and have unlimited access to fresh grass. HELP!!!!!