reproduce.txt
Something goes wrong <sometimes / for some users / occasionally>:
<describe what you see>

Help me make it reproducible. Ask me questions if you need to, then:
- What differs between the times it happens and the times it doesn't?
  Suggest specific things to compare — input, timing, data state,
  browser, network, order of actions.
- What should I log to capture the conditions when it next occurs?
- Is there a way to force the conditions rather than waiting?

Don't suggest a fix. I want a reliable reproduction first.

Intermittent nearly always means timing, state left over from a previous action, or one specific piece of data. Those three cover most of them.