If you're not handling him much, or the only time he gets handled is when he eats, then my guess is he's learned to associate handling with feeding and so he strikes at your hands when you pull him out of his enclosure now. This is why keepers now feed in the regular enclosure, the snake knows that if he's being removed from the enclosure, then he's not getting fed.
I agree with Cyncy's suggestion to hook train him. Also, I would suggest washing your hands in very cold water just before you open his enclosure so they don't give off much heat.
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