I'm guessing you are in the northern hemisphere so you are in the middle of summer, not the middle of winter. Most hens don't go broody in winter, though a few will.
The most common cause of a drop in egg laying is the molt. I know fall is the typical time for molts as the days get shorter but there can be other causes for a molt out of season. It usually involves stress. A change in lighting, running out of water, a change in housing, a change in the pecking order, a predator scare, many possible causes. Are you seeing a lot of feather s flying around?
Sometimes hens cut back production in severe weather, either extreme hot or cold.
A very common cause of you not getting eggs is that they are hiding a nest.
It's possible something is getting the eggs. Many critters would leave a sign behind like egg shells or a wet soggy mess. Not sure where you are located so I don't know what predators might be of concern for you. In the US the critters that typically don't leave evidence behind are snakes, canines, and humans.
A snake will visit, eat however many eggs it can find and depending on size, then go away for a few days to digest them before it comes back for more. If your loss is regular, it's probably not a snake.
In the US most canines like foxes or coyotes would probably be more interested in your chickens than the eggs, but many dogs will eat eggs and not bother the chickens. Does a dog have access.
I'll let you think about the possibility of a human.
So what can you do? If you can lock them in the coop or coop/run for a few days see if your production goes up. That would mean they are hiding a nest or you locked out something that was getting eggs.
You can put some real eggs down but mark them. If they disappear something is getting them.
This can be frustrating, it's not always easy to figure out what is going on. Good luck!
