I've had my chickens stop laying multiple times, not enough forage, not enough light, getting kicked out of the coop for a few days so the new little ones get acquainted with their home, extra work on the coop to upgrade perches or add a nesting box and too many roosters in the flock.
Lots of small issues. I go back to the basics. I keep them in the coop a bit longer than I normally do with a warming light, I give extra feed and check how filled their crops are, make sure there is plenty of water and take some time to watch them.
I had 4 taken by Eagles this spring and that seem to stress them too. Either I have a sensitive flock or its normal for changes to affect them.