i've replaced my D string several days ago, and it's still buzzing, and un-tunes itself after like 10 minutes of playing? advice?
(it didn't do that on my older string, it rusted to a nice bronze in two days and made a good sounds)
Maybe you need a new tuner? It could be loose also. Try tightening it. That's all I can think of right now......it's early.
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You may need a truss rod ajustment. Go to Guitar Center or a local shop and get it taken care of. Or if you know what you're doing then do it yourself, but be very very careful because you could snap it and your whole neck would be ruined.