It is possible he is nervous about the different approach you take when opeing the cage and it can take a while for snakes to settle into a new enclosure - even corns that are relatively tolerant. Some seem to need quite a bit of time, but the aggression is suprising in a snake that was quite tame before.
More hide areas is a good idea, especially if the new cage is bigger than the old one. It is also important to make sure the environment has the right temperature range (not too hot - that seems to stress them out) and is not in an area where he is disturbed.
Is it possible he is coming into a shed? While some of ours were not aggressive in shed when they were very young, when they hit about 10 months old they started being reluctant to eat and getting quite defensive when shedding.
It may be frustrating for you, but it would not hurt to leave him alone for several weeks - no handling except to clean the cage. Just offer food once a week - it may take 3 weeks to complete a shed cycle, but don't worry if he isn't eating for a while. We have had individual snakes that did not feed for 6 months after we bought them, transported them and put them in a new enclosure. No harm will come to the snake from not being handled and I would definately avoid trying to handle him until he is feeding reliably again.
good luck with him,
mary v.
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Mary VanderKop
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