Vomiting / Regurgitation

There are several things that can cause Vomiting and Regurgitation:
Stress resulting from to much handling.
Overfeeding / feeding too large a meal.
Extremes of temperature, too hot or too cold.
Food not defrosted properly.

Don't handle for 24 hours after feeding, and if you transport your animal for any reason allow 5/6 day rest before feeding.
Always make sure the food is fully defrosted and warm to the touch. Check the temperature in your tank regularly.
If the problem persists consult your vet.