We have a flock of 12 week old rhode island reds that have been eating well and healthy until yesterday. When we opened up their coop yesterday morning two were dead, with no marks of foul play. This morning one more was dead, and one laying on her side drooling from her mouth, near death. I mixed up a gallon of Sav-A-Chick electrolyte supplement for the flock. It has become hot here in North East Kansas, which brings high humidity, but we run a fan in their coop at night. They have been allowed out of their coop into their run the past week for the first time. We would appreciate your thoughts!