This is the second hatching this has happened. The eggs will zip..some completely..some almost complete then the chick dies. I incubate at 99.5-100 with humidity 45-50 and LD temp at 99 and Humidity around 55. There are a few who hatch fine but it seems that the splash have the problems. I have never seem this happen before. Does anyone have any ideas what could be causing it and how to fix it. I use a still air Hovabator. Thanks!!