Its the winter. All my balls do the same thing. I have a male that is 1200g and has not ate since 11/15/12 but has stayed the same weight. Its like there hibernating. I would watch the snake very closely and make sure it is keeping good size. If you have a scale that's even better. Also try to feed in the dark. My snakes will sometimes times not take the rat when there is light on the room.
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Hope this helped.
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