Sometimes this just happens. One of the most frustrating parts of owning a Ball. The best advice I can give you is to wait two weeks before your next feed, this has worked on numerous occasions for me. If you feed f/t every now and again, getting the mouse a little extra warm will sometimes entice your BP. If this continues, check your snake over and be sure to look for little moving black spots on his body. This means he has mites, which often makes them lose their appetite.
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