I have a full coop (four chickens). They produced eggs almost every day in the winter and early spring but now they seem to be making them only once every few days and sometimes not even all of them. I have only gotten a large Egg once. 

My coop has four bails of hay on the trough and 45 spots inside of a hardwood fence with about half of that filled with grass (they have stopped eating the hay.) There is no heater and it is the  24th day of spring. I try and pet them every day. There is a Bee hive inside of this space but it has been there for a while. Two chickens have 2 hearts and 2 have 3+ hearts. 

It's possible that I am just unlucky but what are things that specifically make chickens uphappy that I should look out for?