Re-check the temperature of his substrate under his hot side hide, there's a chance the thermostat is failing so the UTH is too hot. You won't see a difference in the air over his hide, you need a temperature gun or IR thermometer to measure it properly.
Otherwise he may have outgrown his hide, or he may be old enough and comfortable enough in his enclosure to spend less time hiding and more time out in the open. Mine also spend more time out of their hides in the evenings when they're hungry, they come out to hunt.
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