We have 14 ISA Browns who, at 1.5 years were laying 12-15 eggs a day between them up until about 4-5 days ago. Very suddenly they have dropped to 4-6 a day. Do egg layers cycle? Should we expect this to pick up again soon? I found a large amount of feathers in the coop today but as far as I know they molted about two weeks ago- is the feather growth related to low lay rates?