About 2 months ago i receved some free chickens, supposedly 2 yrs old. 3 weeks ago 1 just died in her sleep I think. The past 2 days I've lost 2 chickens in their sleep. Very weird. I'm pretty sure it's the chickens I just received. It's like they're going to die one by one and affect my chickens I originally had. Anyone know what they are dying from?? Help!