Hi - ours stopped laying in the hot weather too, but are now back in action. One other thing that slowed them down was red mite in the poultry shed. They will lose some feathers with these little horrors too. It may be worth checking in all the nooks and crannies, and underneath the roosting bars to see if there are any tiny specks of dust on the move. If so, you'll need to get some red mite spray and powder for the chickens too - and empty all the bedding out, scrub the hen house, and then spray it. Within days they were laying again. You just need to keep checking because you may find that more have hatched out again after 3 weeks if you missed any the first time.