slow down in egg laying

[artsy1]

Hi everyone,
My 2 BANTAM RIR'S are 9 mths. old and they have been laying eggs pretty regularly 1-2 a day and now all of the sudden, they are only laying 1 - 2 every couple of days.
I have put a light in the coop for extended daytime light and nothing has changed?????????????????? food is the same, treats etc.
They aren't acting wierd or anything.
Does anyone have any ideas. It has been getting cooler, but not freezing. I live in fla.

 

[M.sue]

I've read hens lay every 24-36 hrs. A missed one here isn't to be concerned about. Even with a light in my coop I have a couple that miss a day periodically.