Burrowing isn't the same as hibernating. Many animals burrow all year round, such as, like you mention, salamanders.
What do you mean that it is "hibernating"? Just burrowing, or something more? Because if it is burrowing, it should come out sometimes, like to eat (though I never kept salamanders on substrate that is deep enough for them to make a real burrow, as they can hide under cork and other substitutes just fine).
Is it taking food when offered? Or has it stopped eating as summer is approaching? If the latter, check conditions (temperature, especially).
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