I've had a Yamaha F310 for ages, it was a cheap acoustic as i mainly play electric but it's played reasonably well up to now, the problem i have is that when i play the 8th fret on my Low E string - either as a note or as part of a chord it sounds awful, it's like a scratchy buzzing noise and i can't figure out the problem.

I've changed the string but that didn't stop it, and it doesn't seem to affect the guitar anywhere else, ONLY at the 8th fret on the low E

any ideas?
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