I've had one cracked egg a day all week. They aren't broken open, just cracked to different degrees. I'm thinking that they are falling onto too hard a surface. My husband was supposed to change out some nesting boxes yesterday but didn't get to it. Hopefully that will fix the problem. My only other question is, could this be the work of a naughty hen? I'm hoping that's not the case. There are usually multiple eggs in the same box and it is only one that is cracked. I don't know where to place the blame.