Hi, I built this guitar a few years back, and I love the sound. I upgraded the tuning pegs.
I never really played it much until earlier this year, I noticed that the G String does not sound quite right.
All other strings sound fine
I usually use 9-42, and I went and bought a slightly heavier duty set, and it seems slightly better. Any other ideas?

I saw some mention of graphite, could solve any movement.
Overall pic attached.