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Any changes at all you can think of, cage cleans or any changes in the area around his cage, sounds, smells or anything different?
My Chinese gets a bit like that when I clean her nest out!
How has taming been going generally? If he does come out I would just keep talking to him without actually opening the cage or going into his space for a bit, maybe try offering him something through the bars & see if he reacts to that.
It's hard to say without knowing more about what he was like previously but possibly you've gone a little quickly with taming & need to take a step back?
They can just get a bit moody sometimes so I wouldn't worry too much!