I recently bought a beautiful new Gibson ES 335 and I'm having a tough time with the tuning of it. When I am finally able to tune it, it doesn't stay in tune for very long and as I tune it I hear the string suddenly twang as if it were sticking on something like the nut or the tuner. Also when it is in tune some chord tones sound a little sharp especially anything involving the 'G' string. I was also wondering if when it is in tune (open strings), if I put a capo on, for example, the third fret should my tuner then read G C F Bflat D g all in perfect tune (because it doesn't)? Any advice here would be greatly appreciated