Well if you insist your temp and humidity are perfect, then look beyond that... What are you cleaning and sanitizing the incubator with between incubations? Are you rinsing and airing it out properly after cleaning? What about the conditions in your house? Do you have smokers in the house? Do you have air fresheners in the house? What about other cleaning agents do you use in the house? What about pest control sprays or applications? Have you experimented with washing/cleaning/sanitizing the eggs prior to incubation vs natural as laid? Have you tried hand turning a batch vs using the auto turner? Have you tried candling every say 2 days and monitoring progress of the embryo to see if there are any issues? Have you weighed the eggs prior to incubation and every day during incubation to see if they are losing the proper amount of water weight over the incubation period? Have you tried using distilled water vs tap water inside the incubator? This is where those detailed logs can come in handy as you try to narrow down the cause...
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