We ordered 30 chicks from a hatchery in February. The majority of which were New Hampshire's. Recently we moved them out to a brand new coop near our house, and have mysteriously lost nine of these chicks since the move. We originally thought that we were having issues with our fodder system possibly producing some moldy food, so we threw it all out and switched them over to pellets. They seemed to do fine with the change. The first nine were acting fine until the night before they died. We went out to turn on their heat lamps and noticed that they had segregated themselves from the rest of the flock and were all puffed up. When we tried to move them back to the rest of the group they wouldn't go, or would move and then go right back to where they had been. I went through everything that I thought it could have been. They had plenty of heat, we switched them off the fodder just in case, I saw no evidence of worms. They looked happy and healthy until just hours before they died. On examination of the bodies there was nothing extraordinary. No body contortions, no discharge, no signs of struggle. It looked like they all laid down and went to sleep. I thought we were out of the woods because it has been a couple weeks since we lost those guys. But now I have two more that are starting to show the same symptoms. I don't want to lose a whole flock of chickens. Does anyone have any idea as to what might be going on?