My girls have gone through that, I find where they are laying, collect the eggs and block off that spot, they move on to find another..lol, I'm wondering if it might have something to do with someone getting broody. Once one girl lays there, the others follow suit. I have 10 nest boxes among 30+ girls, plenty of space for them to lay, they will stuff themselves 2 to 3 to the box leaving 3 or 4 open, they've decided that beside my work table looked good, I collected the eggs and blocked that off, then they managed to push out my barricade and laid up on the shelve under the work table, When my egg count goes down, I've started searching the run.. I've got a NN that lays a blue egg, I haven't seen the egg in a couple of days, so I've got to figure out where she's laying, I had been able to track her, ie: lay on Monday, on Weds I'd have another.