Hope somebody can help me out. I play a cheap LTD guitar, cost me about $250, plus the Seymour Duncan pickup that I put in it which was another $70. It's been serving me well for a good seven years already. I'm left handed and I live in Serbia so it is really hard to find a good guitar without really breaking the bank, so I am pretty much stuck with it until further notice.

The guitar is in Drop C tuning and I've been using a 0.11-0.50 string gauge until recently. I decided to experiment with a 0.12-0.52 gauge, and that's when problems started appearing.

First off, my nut broke off when I removed the old strings. I glued it back on but I'm pretty clumsy so I might not have glued it back on exactly the way it was, but oh well. The new strings kept it in place well enough. After putting on the strings, though, I noticed that a few of the frets were acting strange. Losing their pitch and sustain, buzzing, sounds all messed up.

Not wanting my neck to warp or anything like that, I took the strings off about two weeks later (probably should've done it right away but eh, I'm careless like that) and replaced it with a .011 gauge again. To my dismay, this did not fix the problem and the problem frets were still there, and there even seemed to be more of them.

What bugs me is that it seems that it's only happening on the sixth and fifth string. The other strings seem to sound just fine on all the frets. I have no idea what could be causing this problem. The nut breaking off? The neck warping? Truss rod needs adjustment? I don't know. I was going to take it to a tech next week or something, but since I sprained my knee rather badly a few days ago I can't really move so that's going to have to wait. So I was wondering if someone around here maybe has some advice for me, or has had some experience with a problem like this. I uploaded a recording of me playing all the frets on all the strings (single notes, from the 1st fret to the 24th), and power chords up to the 12th fret on the top three strings. These might give you a better idea of what's going on.

As I said, it's the 6th and 5th strings that are problematic. The rest sound fine to me. The ones on the 5th string sound wobbly and out of tune, and a few on the 6th string (12th fret and above) are basically dead. Thank you in advance for any help that you can provide me.

It has a fixed bridge, the guitar itself looks like this: http://i.imgur.com/yzSd8Nc.png


You can find the recordings here: https://www.sendspace.com/file/8ykqew (UG won't let me upload a zip file here for some reason o.O)
Last edited by Dzamija at Aug 20, 2016,
Replace the nut. If you don't know how, take it to a tech.

Broken nut means it probably was put back in place wrong, those strings are probably closer to the frets than before. Replace it.
Hmmm...I wonder what this button does...