Hi,
to the forum.
The first things to check out are the husbandry and the way the food is offered to see if there is anything we think might work better.
Can you give us the low down on your enclosure with the temps (and the place and method of taking them ) and run us through how you prepare for the feeding and how/ where you offer it?
Hopefully there will be a few simple things we can suggest that might help.
dr del