I'm still at entry level equipment and have an ibanez gio180. The cheapest of the bunch. And about half a year ago it started to have extreme fret buzz from 6th till 12th fret. I've adjusted the action to super high just to get rid of the buzz but it's still there. When you look down the side of the fretboard, from the body to the head, the tips of the frets make an "s". Where the first tip of the curves is at 5th and second at 12th fret. Is there a way to fix this or is it time for a new neck(or bass). Hope that i explained it good enough.