Last night as I was tuning up my new Standard, I noticed a strange harmonic at the fifth fret of the low E. When I hit the fifth fret harmonic under gain, the tone is uneven. It is just like hitting the fifth and seventh fret harmonics on two strings that are out of tune- you get that fluctuation. It is only on the low E, no other strings. Is this a "wolf tone"? The string tunes and intonates fine, and fretted notes sound fine. It is only when I hit a harmonic. I just checked it again, and accually it does has tha fluctuation on all the harmonics all the way down the neck. I tried raising the action, it did nothing.