Yup, genetics could most definitely play a role. I won't go into much detail, but we know a guy who has balls that seem to genetically not want to eat. We originally bought one from him, never ate right for us and died. The guy was nice and agreed to replace it when his next clutch hatched earlier this year. The clutch hatched and he had feeding issues, so we waited. After he claimed it ate 3 times we picked it up. The card was full of force feeds and only one alleged feeding on its own. Well, we had the same issues with the ball. It didn't want to eat. It ate once for us. Last I heard from the guy he was still having feeding issues with the others. He is someone I would definitely never go through again. Others I have spoken to have also had problem feeders from him.