I started incubating a dozen eggs a week in my Genesis 1588 in early February. I have a 48 egg automatic turner and each week I transfer a dozen eggs to a hatcher (just another 1588 without a turner), and put a dozen new eggs in. All through February I was getting almost a 100% development in my incubator and an 80% hatch rate in my hatcher. But then my hatch rates started to drop and I only got 2 chicks out of the last batch of eggs. I don't know what is causing it. I have not changed anything. I clean and sanitize my hatcher after each hatch. I have cracked open every unhatched egg and they all contain fully developed chicks. What could the problem be?