I've had another report like this (they claimed it had been down for days). But I haven't noticed anything wrong with it (and I'm using it a lot). What did 'down' look like?

Also, though GitHub's lack of reliability was part of the motivation to self-host, it was only a minor factor. The way they are trying to make Copilot a thing, at the cost of everything else, the way they handle US sanctions by blocking everybody from entire countries, and the way the web interface feels ever more heavyweight and sloppy were also factors.