# 2026-March-19 Service Incident

- Provider: [Sauce Labs](https://down.guide/providers/saucelabs)
- Confidence: Confirmed
- Impact: Partial outage
- lasted 1h 2m
- started 2026-03-19 09:51 UTC
- US-West, US-West
- us
- id: DWN-41196e4b21
- Official page: https://stspg.io/qsrmlzlqy09n

## Root cause
> What happened: Approximately 15% of iOS devices in our US-West data center were temporarily unavailable for customer test sessions due to failed internet connectivity checks.

Category: Data center or power. [Postmortem](https://stspg.io/qsrmlzlqy09n)

## Updates from Sauce Labs
### 2026-03-19 09:51 UTC: investigating
Around 4:45 AM UTC we started experiencing lower iOS device availability in the US-West data center. Our team is actively investigating the root cause and working toward a resolution.

### 2026-03-19 10:54 UTC: resolved
This incident has been resolved and our services are fully operational.

### 2026-04-10 22:59 UTC: postmortem
Dates:
Wednesday, March 19 2026, 04:45 UTC - 10:47 UTC.
What happened:
Approximately 15% of iOS devices in our US-West data center were temporarily unavailable for customer test sessions due to failed internet connectivity checks.
Why it happened:
An automated wireless network optimization feature adjusted transmit power levels on access points serving the affected devices, degrading wireless connectivity and causing devices to fail their availability checks.
How we fixed it:
The affected access points were identified and restarted, restoring normal wireless connectivity.
What we are doing to prevent it from happening again:
Evaluation of the automated optimization tools and a monitoring improvement.

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