I have had the same problem before with some of my satanics. there is nothing that I saw that I did wrong. Everything is good and then one day there is a dead gecko. I know it sucks I lost 2 CB 3 month olds and had the vet look at them and he said that there was nothing wrong with the animal that he could see. I know it sucks but I would not blame your sellf. If everything goes well I will have some CB babys soon I will post here when I get them hatched. If you are interisted E-mail me.
Sorry for your loss
Mike
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Mike & Cherly Garrett
Critters Unlimited
Houston TX
6.8.0 U.Phantasticus
1.7.1 Crested Geckos
1.1.0 Leopard Geckos
1.3.0 U.Sikoare
1.0.0 U.Henkeli
1.1.0 U.Phantasticus?(Giant Satanics or U.Malama?)
0.0.1 Ball Python