Had trio of adult pancakes for z15 years. All was well until today. One female felt very light when picked her up and died within two hours. Didn't get to see her yesterday but seemed fine two days ago. Others seem fine. All others torts in collection seem ok.

Found infertile egg about a month ago but not sure which female laid egg.

Any ideas why it died so quickly?

Thanks. Do not want to find any more surprises.