Tom, I use a LabLine pro incubator that I bought at an auction. Has a temp limiter, also. I suspect just bad luck, or brother to sister issues. Could also be father/daughter...not sure who bred her. One is still alive, and feisty! Her first clutch, too. Found out my Mussurana likes deceased womas, but it was a problem getting the deformed part down. I still have 6 from the mother in the incubator and they look fine.