A big part of my job is doing code reviews, and its very common that pages or diffs just don't load. Or PRs literally don't appear in the PR list, even though they exist. It's a daily occurrence to play the 'is my internet down or is GitHub just being shit again?' game.

Oh, and don't forget the cases where the diff view sometimes misses some files for unknown reasons. Both in the 'new experience' and the 'legacy view'. You just can't trust it as much anymore.