Any idea why a BP would stop eating F/T adult mice? It's almost like he's scared from the mouse :\

He switched over to adult mice about a month ago. Ate two of them, then I had to skip a meal due to shedding. The week after that he refused to eat, so he hadn't had anything for 2 weeks. 3rd week came and he refused an adult mouse again so I offered a fuzzy (from petco) and he ate. Next week I offered two fuzzies and he ate them both. Today I'm trying to give him an adult mouse but he won't take it again