I hatched some quail chicks 4 days ago and they were all doing perfect but when I got home from work today 4 of them had died. The other chicks all looked pretty lethargic so I took them outside on some grass and they perked up alot but once I put them back in the brooder box they all returned to their lethargic state. A few fall asleep standing up and their heads down. Maybe they're just tired?? I have hatched quail chicks before and I didn't have this problem last time. Can anyone please tell me what's wrong with them?