This last one had 1 day of acting weird where was sat a lot panting with wings loose with her tail kind of down, then was acting normal by the end of the day. She laid an egg that day, then the next, then no egg for 2 days and died the day after. That entire time she did everything as normal up until she keeled over. Now that day she was acting weird I wondered if she was egg bound or something, but she laid eggs, wasn't pumping, wasn't doing the penguin walk, wasn't straining, poop was normal, and she wasn't lethargic. So maybe some kind of internal reproductive issue? She looked perfectly healthy on the outside.
Second chicken I have no idea what happened because I was out of town for 2 nights, chickens were being watched by a neighbor. The day I was coming home she was apparently getting lethargic and just keeled over dead by the run door, looked healthy as could be and laid an egg the day before based on what was collected. I didn't feel anything weird when I examined the body.
First chicken seemed to be a crop issue, presented both like sour crop and a bit like impacted crop, tried treating for a few days but we lost her.
Super frustrated, they have a safe enclosure with clean water, balanced layer pellets, oyster shell grit, shade, wading pool in the heat. They've never had mites, lice or anything else. No bumblefoots or pecking or anything. Just fine, healthy seeming chickens and then something goes wrong.