Guitar won't stay in tune

[LeftyF2003]

I bend a LOT, so I always put some Nut Sauce i(unfortunate product name) in the the nut slots when I change strings. Get some off Amazon and put it in the nut slots. Try doing a bunch of bending and see if it stays in tune. If so either polish out the slots with a fine file, or have a tech do it if you're not confident with tools. As dave said the first thing to do is the capo at the 1st fret trick which eliminates the nut. If it's still going out of tune turn your attention to the bridge. Also, if you can, post some closeup pics of the nut and the bridge with the strings removed or pushed out of place so we can see the condition of the slots.

 

[jamhandy]

Something I picked up while watching YouTube videos... when you change strings, snug up all your Phillips head srews, nuts, etc on the entire guitar. Like... tighten the strap buttons (not related to tuning issues, but sometimes get loose)... tighten any screws or hex nuts anywhere on the guitar. While the strings are off would be the time to tighten the tuners if they are a little loosy-goosy.

Locking tuners clamp down on the string, but it might be they are still being pulled a bit. If they have a small Phillips screw on the end of the tuner, and small tweak on that on the edge of the tuner usually tightens everything up.

Good luck.

 

[jamhandy]

Using a guitar tuner, when you tune your guitar, always go down below the note you want and bring the pitch up to the proper pitch. If you are higher than the intended note and go down to match the correct note, the tuner can move a smidgen..

Sometimes I will go through all six strings intentionally going below the note needed, and turning the tuner up to the right pitch. It does make a difference. I may ever go as low as an Eb on the E string and bring the note up to pitch with the tuner to E.

And make sure your locking tuners aren't loose at all.

You didn't mention a tremolo, but I see that model has a hard tail bridge... so not the trem...