check or get your nut checked for problems.....heres a little test to do that can determin if the nut is seriously bad......tune your guitar and then double stop tune it(i.e 17 fret b and 12 fret high e)if its out of tune up there somthings wrong.....i had that problem with an ibanez gio but i assume there not much of a difference if at all.............good luck!