Yes, as I've said chickens are weird and fickle creatures. We in September made a new coop, a larger one from a metal shed. And for a few days those girls were cussing around with their legs crossed I swear. Our bantam Brahma Parmesan even went as far as chasing us around the yard and jumping to peck us to let her know how mad she was.
For the Dye trick you do it once they've gone on the roost. Also suggest scouring your yard, we have 3 broodies 2 hardcore sitting on eggs due to hatch any day and the other is just a bit like whatever but is sitting in the same nest with the other broody. So that makes me down three eggs. Then because broodies are in said nest boxes I purchased new ones, and guess what girls hate them, they've started laying in them a bit since I raised them from the ground with flower pots. Then we have a Polish who is just a mad woman, and lays in a dark Terra cotta flower part on the deck.
Our roo stresses the girls out from time to time with his hard mating a few bare backs in our flock. But as Nicole01 said could be many things. I changed my birds from layer feed to 17% all purpose because I have a mixed flock, the extra calcium in layer feed isn't good for the roo's or younger chicks so the 17% all purpose has none. Then I also add to their all purpose a 75lb bag of Game bird supreme which has Calf-manna in it and surprisingly the only time we get a weak egg is from a new layer. Our shells are like rocks I swear.
So, check everything you can, calcium,protein,molting. Try giving them some canned or dried cat food to up the protein maybe if they're being mounted by the roo their slowing down because they're growing feathers back as well. Parasites, worming all of that could just be they're stressed, and some just don't lay well as stated before.
Hopefully it all helps.