Substack change history: Increased error rates

Substack reported a major incident with increased error rates and system-wide performance degradation affecting publications, writer dashboards, Substack.com, the app, and post editor. It started at 2025-04-29 18:15 UTC and was resolved at 2025-04-29 19:16 UTC, lasting 1 h 1 min; full recovery was reported at 18:41 UTC.