I always have my Temp at 101.3-101.7 in a still air, and Humidity at 45-50% of the first 18 days, then around 65% the last 3, but it always jumps over 70% when thay are hatching. Are you candeling, are the eggs actually developing. Are the eggs shipped, Maybe it's fertility issues. Are you sterilizing the bator between hatches, it could be a problem with bacteria. There can be so many reasons. I know with my LG, the temp would spike in the afternoon when the sun hit the side of the house, and if I wasn't home at the time, I would have never known, because it would equalize again when the sun set.
Good luck, Maybe consider upgrading to a Hovabator Genisis 1588, My hatches have been much better since I upgraded, I still use the LG as a hatcher, that way I can staggar hatches.
Good luck, Maybe consider upgrading to a Hovabator Genisis 1588, My hatches have been much better since I upgraded, I still use the LG as a hatcher, that way I can staggar hatches.