This may be hard to grasp at first, but there is a great chance that you actually may have been selected to participate in the "takening"!
Happened to a friend of mine once, he was noodeling around on his telecaster playing the opening part of starway to heaven when suddenly high pitched 4k sound appeared out of his ac 30 and BOOM he was gone!
Only thing they found in the living room was a part of a burned left sock and a note stating that the "aliens finally got me"
He did come back though and refused to say if probing took place or not...
But try another cable as someone stated earlier to see if that helps. RF interference is a pain to troubleshoot and i hope you will get it sorted out.
Sounds like it could be something automated causing the interference as someone also stated, so streetlights, mechanical shops, neighbours robot lawnmower nearby etc. Keep notes of time of day it happens and narrow it down from there. And be sure to rule out aliens