# Substack: Major incident: Increased latency and errors

**Summary:** Substack reported a major incident causing increased latency and errors across its websites and applications, including custom domains, publications and writer dashboards. It started at 2025-01-21 23:44 UTC and was resolved at 2025-01-22 00:36 UTC, lasting 52 min; no specific cause or fix was stated. _(machine-written, sol)_
- Kind: Major incident · Label: degradation (model (Jev))
- Changed: 2025-01-21 23:44 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/szrlsbzgs2tp](https://stspg.io/szrlsbzgs2tp)
- [Company: Substack](https://rewindex.com/company/substack.md)
- Versions: before (none: first archived) → after incident\_version:261/tsb5m2pd4m2n@05bd34fb93d5
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Increased latency and errors
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2025-01-21 23:44 UTC
```

**5. Added: Resolved time**

```diff
+ 2025-01-22 00:36 UTC
```

**6. Added: Affected components**

```diff
+ Custom domains, Substack.com, Substack publications, Writer dashboards
```

**7. Added: Update** (investigating) · 2025-01-21 23:44 UTC

```diff
+ We are investigating reports of increased latency and errors for Substack.com, publication websites, and the Substack app.
```

**8. Added: Update** (investigating) · 2025-01-21 23:48 UTC

```diff
+ We are continuing to investigate reports of increased latency and errors for all Substack websites and applications.
```

**9. Added: Update** (identified) · 2025-01-22 00:12 UTC

```diff
+ We have identified the issue and are beginning to see recovery across all Substack websites and applications.
```

**10. Added: Update** (monitoring) · 2025-01-22 00:20 UTC

```diff
+ Substack websites and applications are fully operational and our team is monitoring.
```

**11. Added: Update** (resolved) · 2025-01-22 00:36 UTC

```diff
+ This incident has been resolved.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2025-01-21 23:44 UTC | Major incident: Increased latency and errors (this change) | degradation |

All Substack changes: [timeline](https://rewindex.com/company/substack/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


---
Canonical: https://rewindex.com/change/iae392425c33f8c · Markdown: https://rewindex.com/change/iae392425c33f8c.md · JSON: https://rewindex.com/api/v1/changes/iae392425c33f8c · Generated 2026-10-18T02:28:39.520Z