Am I doing something wrong?

[Meggies Eggs]

I have almost 60 birds of various breeds. At this time 15 of the hens have been laying for a year, 24 are just now starting to lay, and the rest are to young yet or roosters (2 mature, 2 immature). Anyway, to the point. I am not getting as many eggs daily as I was say 3 months ago, and every once in a while I get a really thin shelled egg, or a rubbery egg. They have layer feed, corn, oyster shell, grit, and they are free range. I can't figure outwhat is wrong. They have plenty of nesting boxes and roosting spots and everybody gets along just fine! So what can be wrong? All seem happy and healthy!

 

[GC-Raptor]

Heat, is it hot! That will slow them down. I run a fan in my coop at night to circulate the air, not blowing on the hens, if its above 55 Fahrenheit. There coop and run are under a shade tree, I have a chicken bath they can walk through. Are your older hens starting to molt? GC

 

[Meggies Eggs]

They have a fan, but you called it everyone is molting (I keep laughing at the roosters lack of tails). I'll try the water foot bath! We have a couple cool days ahead, may be that will help too!as free Rangers they have plenty of trees and weeds to hide in! Thank you