Ok I think I figured this one out. I'm using the GitHub GraphQL API, and was adjusting some overly conservative pagination limits so some folks with a ton of repos can see all of theirs listed. Turns out I went a bit overboard and went past the limits GitHub had set in place.
Shipping a fix now, should be up in a couple of minutes (if only I could use Reflame to build the backend of Reflame... maybe one day...).
If you could open up a support chat so I can grab the user ID and get back to you when I have a fix, that would be super helpful!