Pacattack

I've had my albino pacman frog for a year now. He used to feed good and agressive your now he isn't really interested in eating. I have to run it against his mouth awhile until he finally eats it. And when he does he snaps it up like he's really hungry. I've tried everything! Crickets, waxworms, pinkies, nigtcrawlers. He just isn't interested!!! This started in December. Why won't he chase and bite at his food anymore. He just sits there until I try to feed him. Temps are normal, clean cage everything is right he just changed all of a sudden.
Has anyone else had this happen!!!