In two of the five positions on my Strat I get a crinkly static noise whenever I play hard on the treble side strings from around the 4th fret to the 9th. What is this noise and how can I fix it?
Are the strings fretting out? Action too low?
Back bow in the neck?
Is a fret lifting out of the slot?
Treble side of the bridge too low?
High E nut slot too deep?