In summer there is a lot to eat where I live. So if they forage most of the day, they will not eat as much feed, which has the nutrients needed for egg production. And to top it off they eat less feed in warm weather, than cold weather.
I only let my hens out to forage an hour before sunset daily, weather permitting.
Check your feed for mold or bugs. Smell the feed if it has a strong smell or smells musty or damp, get rid of it. Thoroughly wash feeder.
Are you buying a large bag of feed?
With only 2 chickens a 40/50# bag would go bad before its used up.
I had egg production drop by 50% last month, when the feed was 5 months 1 week old, from mill date. This feed was stored in original bag tightly closed with a bag clip in my house at room temperature. Feed was added to feeder weekly. Bag stays in house.
The feed looked good, smelled bad.
I thoroughly washed the feeder and refilled with fresh feed, (smelled like fresh grains) less than a month old from mill date.
In 2 days egg laying was back to normal.
For 2 chickens I would purchase a 10# bag, 20# max.
I let the hens feeder get nearly empty and clean monthly in damp or humid weather. My feeder is in the coop.
Feed stored in coop or shed in varying temps will not last 5 months.
Organic feed doesn't sell nearly as fast as regular Non-Organic feed. Check the mill date before you buy. Hope you figure it out. Offer Oyster Shells in a separate container, even if you feed a layers feed. GC