Buzzing in two frets only.
I have a Chinese made solid tenor that I got a few years ago. I haven't done anything with it as I got the Barron River tenor not much later. I've been thinking about gifting it to someone, so today I took it out of its bag to see how it sounded. It actually had a great sound, very sweet acacia tone.
However, when I fret the A string in the third and fourth fret, it buzzes (fourth fret buzz is more intense). Open and in the first two frets, and in the fifth+ fret, it is fine. It is only the A string, the others are fine. I swapped strings, but there was no change.
Is it safe to assume that the buzz is caused by the fifth fret divider? It doesn't look raised, but the symptoms seem to indicate that this might be the issue. How do I fix this? If I need to buy a tool, what exactly will I be looking for? I'm not crafty, but I can follow instructions.
The uke may have been exposed to dry air in the winter. It was stored in an unheated closet where I didn't measure humidity.
Playing reentrant sopranos: 1920s Lyon&Healy (mahogany, D), Black Bear (koa, C), Famous FS-5G (lam. koa, D), a tenor: Barron River (cypress, Bb), and a parlor guitar: Alvarez AP70.