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. It's like hitting an empty barrel or pot with different water levels. I tried changing the action and moving the saddle, but nothing works. And it's not something with hardware, because it's still there when im not even plugged in. Sorry for mistakes, english isn't my first language.
On the sound file i play E string on 5th, 10th, 20th, again 20th, fret and then an open string. It's not very audible on the file because phones micro just can't really pick up the ringing on 5th and 10th fret
20210716_174710.amr