That is either a truss rod adjustment or the bride needs some attention. The term is the "action" is the distance between the neck and the strings
Guitars can usually be "setup" to play for different climate and typically can go out of adjustment. Tuning, string height, intonation, sharp frets, and wood shrinkage are typical factors in this area. Bring the guitar to Dorsey Music and they will help you with it.
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