Ok so i noticed this problem a while ago, i cant play the notes on 18th,19th an 20th fret on the high e... i mean i can play them if i press VERY hard and still they dont sound smooth. i can play normally on 21st and 22th fret. (I am using Epiphone Les Paul standard) Does anyone know what is causing this problem, and can i fix it ? Please help ! Thanks in advance.
Action may be too low, easy fix, just raise the bridge on the high e side until the notes are playable, if not it might be a truss rod issue where it curves backwards too much