I have a small mixed flock of laying hens, no rooster. Every three or four days I go down to the coop & find one dead, sometimes overnight, sometimes when I go down to put them to bed at sunset. They are not showing signs of sickness -- eating, puttering around and behaving as normal. They recently stopped laying, so I'm sure something is going on, but I cannot figure it out. The ones that have died are all healthy, not skinny or droopy at all; wattles stay bright red and upright, etc. There are a couple of girls that I've observed with loose stool, but within a day or two they're back to normal and doing fine. Any ideas?? I got an order of 4 week old chicks, but kept them isolated for two weeks to be sure they were healthy before putting them in with my girls. They are all super zippy, I haven't lost any of them. I've researched cocci, and other chicken diarrhea stuff, and nothing seems to match. I live in a very rural part of TX, and there are no "chicken vets" anywhere near, so that's not an option. I am at a complete loss, and could really use some help! Thank y'all in advance.