My hens lay less in very windy weather, even though they have a fairly protected spot. Molting is possible, but their combs would not be red, and is unlikely bc the amount of sunlight they are getting is at its highest point of the year (yes, technically decreasing now, but still high).
Water: If they are not drinking enough, the first thing to go is egg production. They like cool water, not warm, so make sure it is in shade and/or switch it out a few times a day or add an ice block to the waterer. If you are using nipple system, add some pans of water to see if they up their intake, or provide them with wet feed. Mine think wet feed is amazing, so when it is very hot, or very cold (like going to be below zero at night) I provide them with wet feed. When hot, they hydrate better bc they gobble down the soupy feed. In very cold weather it is to try to get them to eat as much as possible in the short daylight hours so they can keep warm better in the cold night.
Additives in water: Whenever additives are in one waterer, provide another waterer with plain fresh water. Don't add additives in a metal waterer. Rusty waterer - they don't seem to like rusty water in my experience.
Predator stress - its a real thing! Even if the predator does not breach the coop, hearing new noises or predator noises, etc will stress them out and affect laying. Recently my neighbor's entire flock was killed over 2 nights by coons. Then they were also coming over to our yard to investigate our chicken setup and spending a lot of time digging aroud the fence. Egg production dropped. Between 2 neighbors and myself, we trapped and killed 9 raccoons. While there are still coons around, they are not bothering our chickens now (that we can tell) and we are getting more eggs per day.
Age of hens/breed of hens: Affects production or laying life (how many years they lay fairly frequently).
Bullying: Sometimes bullying affects the ability of one or more to get to the feed and water. If you have more than one feed/water station, you should be ok from that perspective. Once we had a rooster that HATED 3 pullets. HATED. He would patrol the feed, patrol the coop door, etc. We had 2 feed/water stations, but would let them stay out longer to fill up on feed without being chased by the rooster. We ended up selling those three so they could hopefully have a better life in another flock. Then we had a pullet/hen that stayed in the coop nearly 24/7 due to bullying. We ended up having to put feed and water in the coop for a few weeks for her. The situation resolved after awhile, but while it was occurring, that pullet/hen was not able to really eat without our helping with the logistics.
Good Luck!