# Grain: Critical incident: Audio corruption on some recordings

**Summary:** Grain Recorder experienced audio “popping” on some calls in a critical-impact incident starting 2023-11-28 18:34 UTC and lasting 20 days 23 h. A fix was deployed by 11-29 15:37 UTC, but affected recordings cannot be repaired. The incident was resolved at 2023-12-19 18:20 UTC, with no further instances reported since the fix. _(machine-written, sol)_
- Kind: Major incident · Label: degradation (model (Jev))
- Changed: 2023-11-28 18:34 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/qsx9w403y5c9](https://stspg.io/qsx9w403y5c9)
- [Company: Grain](https://rewindex.com/company/grain.md)
- Versions: before (none: first archived) → after incident\_version:20/j5736sqnkc43@d7b29eece43f
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Audio corruption on some recordings
```

**2. Added: Impact**

```diff
+ critical
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2023-11-28 18:34 UTC
```

**5. Added: Resolved time**

```diff
+ 2023-12-19 18:20 UTC
```

**6. Added: Affected components**

```diff
+ Grain Recorder
```

**7. Added: Update** (investigating) · 2023-11-28 18:34 UTC

```diff
+ We have started receiving reports of audio "popping" on some recorder calls. The team is investigating the root cause and a resolutions.
```

**8. Added: Update** (monitoring) · 2023-11-29 15:37 UTC

```diff
+ The underlying issue has been uncovered and a fix has been deployed. We are monitoring for further issues. Unfortunately the audio on impacted recordings cannot be repaired.
```

**9. Added: Update** (resolved) · 2023-12-19 18:20 UTC

```diff
+ We have not seen any further instances of this issue since the fix.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2023-11-28 18:34 UTC | Critical incident: Audio corruption on some recordings (this change) | degradation |

All Grain changes: [timeline](https://rewindex.com/company/grain/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/i9f44f526fa8db8 · Markdown: https://rewindex.com/change/i9f44f526fa8db8.md · JSON: https://rewindex.com/api/v1/changes/i9f44f526fa8db8 · Generated 2026-10-18T03:55:43.700Z