I have had my chickens for 9 months. They have been doing great laying eating in and out of there Coop no problem like clockwork. But then last week we had our first snow of the season it was very cold and snowy I left them in the coop during the storm. When the weather got nicer the next day I opened the coop and now they don't seem to want to come out they come out to eat and drink and go right back in the coop even in 70 degree weather.since I am new to this is there a problem or something I should be worried about