Mine was having similar problems. Beyond what's been said about thawing in the room and heating the rodents to get a response, here's what I've done to get an animal that was skipping feedings to eat more regularly:
- Additional cover in his enclosure. Tighter/darker hides, plants, pcv tubes, etc.
- A standard feeding regimen, offering it to him the exact same way every time.
- After he's struck and is latched I make the rodent "struggle" a bit, lightly tugging.
Between these three things, he's now eating regularly and has actually been getting more willing to strike out at me when I open his enclosure and snatch up the food items immediately when offered with a strong strike.