When i play on E and A string on 12th and further frets i get a very dull sound and strings just don't ring, although i can make out the notes. The sound is similar to when you hit a metal barrel or pot with some water in it. And it's definitely not a problem with electronics, because the problem is still there when im not plugged in. On the recording i play on E string on 5th, 10th, 20th, again 20th and then an open E. So if you compare open E, 10th and 20th frets you'll hear that 20th fret doesn't ring at all. It's hard to make out, because my phone mic hardly catches ringing, but it's still enough. Sorry for any grammar mistakes, english isn't my first language.