Are you thawing them out all the way? If its a regurge problem, and your thawing the prey items out all the way, then it could be a parasite's maybe. How long have you had them? Have they ever given you problems eating, before? Besides the regurge, males are known to go off feed during the breeding season. So if he isnt eating i would offer a prey item every 14 days or so, if he doesnt take it then leave him alone. Anyway, try and have a fecal done. Who produced them? Just curious. Good luck.