Piano.io experienced a major incident on April 27, 2026 affecting Composer Experience Execution - US, lasting 16h 23m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Apr 27, 2026, 04:57 PM UTC
We have found an issue with our priority rules for API interaction on server/edge in Composer. The dev team is currently investigating. Clients may find their list order being changed or unsorted without any user interaction. We will continue updating this incident once we identify the root cause.
- investigating Apr 27, 2026, 06:37 PM UTC
Our team has restored the priority rules to their pre-incident state while we continue to investigate the root cause. We advise customers to avoid making changes to priority rules until the investigation is complete. We will provide further updates as more information becomes available.
- monitoring Apr 27, 2026, 10:01 PM UTC
The issue has been identified and mitigated; we will continue monitoring the remediation.
- resolved Apr 28, 2026, 09:20 AM UTC
This incident has been resolved.
- postmortem Apr 28, 2026, 02:04 PM UTC
RCA report for the incident is available at [**this link**](https://docs.piano.io/wp-content/uploads/2026/04/2025-05-06-RCA-Experience-Priority-Data-Incident.pdf).