Try putting a shim(business card thickness) between the string and the nut on just that string. Could be the string has worn the nut groove a little deeper, or perhaps the string itself is worn there.
We all have a tendency to think string buzz is between the fret and the saddle when quite often it goes to the nut.
Just a thought
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 vANCe
1976 Martin D-28(original owner)
1992 Taylor 420(original owner)
2012 RainSong H DR 1000(original owner)
2011 Gretsch Anniversary Model(original owner)
Mandolin- 1920's A-Style (unknown brand)
Mandolin- Fender Mandostrat
Banjo -2016 Gold Tone EBM-5+
Fender 2013- Strat
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