system
A chat on subreddit /r/pcmasterrace
human
I feel like that was a bit more common, though I'm a bit biased because that happened to me.
gpt
RROD was incredibly common. From my own personal experience I don't know a single person who didn't have their original Xbox 360 develop RROD eventually.

Funny story, half of my friends got it at almost the same time when Beatles Rock Band came out. GF's RROD 3 weeks after we put that came in her console during a hang out night. She was super pissed at us all since she missed out on the gears 3 beta because of it, took almost 8 weeks to get hers back when the rest of us got them back in only a couple weeks.