I consistently have "quitters" at about 16-18 days. Last batch of 12 only 1 hatched- right on time. I waited another 6 days for the 6 that candled and showed near term maturity. Never hatched. Did eggtopsy and it looks like they are quitting during the last week before hatch day. Not sure what I am doing wrong. I am using dry hatch method and bringing humidity up to abou 60-70 % for lock down. My humidity wants to flucuate quit a bit during that last 3 days, though. Could that be the problem? I work during the day and get the humidity up before I leave in the morning, it is down again by evening when I get home, get it back up, go to bed, in the morning it is back down. (Yes I have a cheapo styrofoam incubator with an egg turner from TSC.) Temps seem to stay pretty consistent, unless, of course my thermometer is off???) Any clues?