Have you made any truss rod adjustments? Or lowered the saddle? Changes in action and relief can choke off tone and volume. when i first received my (used) Webber jumbo, it had very little volume, but sounded good. After a visit to my luthier for a set up (where he replaced an improperly intonated saddle, added relief, and adjusted the action), it sounded much louder, and the tone really bloomed.
While humidity is one of the more likely causes, there are a number of possibilities.
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