An update. Changed this chord, that chord, moved the phone away, changed guitars. Same problem happening with the same notes. Only things I can't change are the USB cable to the computer and the computer because I don't have spares.

It must be something I am doing when I play. Maybe I am triggering a resonant frequency or my hand is causing a very high harmonic. This happens on my D string.

I am going to go to a friend's house and try it there. If I don't get the problem, it's my equipment. If I do, it's me.

Thanks for all your help.

2b


i5-3210 laptop. Win 10 Home. 2.5ghz, 64 bit. 6gb RAM. Focusrite Scarlet 2i2.