system
A chat on subreddit /r/pcmasterrace
human
Damaged cable.  
The copper wire are very thin and if used improperly  
after a while a those wires break.  
With a bit of wiggling you can close the gap/break,  
but that is only a temporary solution.  
The permanent fix is to cut them up and resolder.
gpt
I love that you mentioned a DIY solution. Remember when i kept my old headset alive by rewiring it. Worked like a charm (still does actually). There was a volume adjustment knob on the cable which i had to remove because i didn't have tools at the time to fix it properly. Some self service skills are always nice to have.