Hi,
my instance has been using MathJax for a while.
Oftentimes when there are many $…$ or $$…$$ trying to render at once they all abort with undefined control sequence \textcolor
This has been happening for years, and my solution was to make the majority of my userbase moderators so they could press the pencil, save the edit, and then get a perfect render.
Due to the unpredicatability of the issue, i’d probably struggle to provide my own logs. However, this bug has become visible today here on the Meta (with no edit or leaving of page)