Went out one morning to service my coop and found one our Rhode Island Reds dead with no trauma, and there was no sign of previous disease. It was totally unexpected. Now the other 3 Chickens have stopped laying, as if they are depressed. not sure what is going on, other than one has just finished molting and the weather is starting to cool. But it has been over a week, and no egg production. A COMPLETE HALT. Any suggestions???????