I have a fairly new (I've had it about 2 months) Ibby SR300. I have been generally pleased with how it sounds, and I love the slim, fast neck. I have noticed, however, that one note, the 5th fret, E string A, is kinda weird. When I pick the note, it as it rings, it sounds like it goes flat. I have not noticed this with any other note on the E string. Can any of you more experienced player suggest what may cause this? Is it the bass, is it in need of an adjustment, is it the string, etc?