Sui Network Restores Operations After Fixing May Outages

The Sui Network has successfully resumed normal operations after addressing the software issues responsible for three separate outages that disrupted blockchain activity in late May 2026. The incidents, which occurred on May 28 and May 29, collectively resulted in more than 15 hours of downtime, temporarily preventing users from processing transactions and affecting overall network performance.

Following an extensive investigation, the Sui Core Team identified the root causes of the disruptions and released corrective updates. Validators subsequently implemented the fixes, allowing the blockchain to return to normal operation.

First Outage Linked to Software Update

The initial outage took place on May 28 and lasted approximately six hours and forty-four minutes. During this period, block production stopped entirely, leaving users unable to submit or confirm new transactions.

According to the Sui Core Team, the issue originated from a bug introduced in version 1.72 of the network software. The update included a new address balance feature, but it inadvertently created a flaw within the gas charging mechanism. As a result, validators repeatedly crashed, creating a loop that prevented the network from functioning properly.

Engineers quickly began working on a solution and released a temporary patch to restore services. Although developers recognized a small risk associated with deploying the emergency fix, they determined that restoring network functionality was the most appropriate course of action given the ongoing outage.

Additional Issues Surface During Recovery Efforts

While the temporary solution initially appeared successful, a second issue emerged during the morning of May 29, leading to another interruption of blockchain operations. This outage lasted several hours before services were restored.

Later the same day, a third disruption occurred during a scheduled epoch transition. Validators were in the process of restarting systems and deploying the latest software corrections when another previously undiscovered bug surfaced.

The newly identified flaw affected the way validators stored randomness-related data during system restarts. Because of this issue, the network was once again forced offline while engineers developed and implemented an additional fix.

The first outage began at approximately 7:00 a.m. Pacific Time on May 28 and concluded around 1:30 p.m. The second outage started near 5:00 a.m. Pacific Time on May 29 and ended around 8:30 a.m. The third disruption began at roughly 1:30 p.m. and continued until approximately 7:20 p.m., resulting in repeated service interruptions across two consecutive days.

User Assets Remained Protected

Despite the extended downtime, the network maintained the security of user assets throughout the incidents. Completed transactions remained valid, and no previously finalized transactions were reversed during the outages.

The Sui Core Team reported that user funds remained secure throughout all three disruptions, helping users avoid direct financial losses despite the operational interruptions.

This outcome was viewed as a critical factor in preserving user confidence while engineers worked to restore network functionality.

AI-Assisted Investigation Accelerates Resolution

Following the incidents, the Sui Core Team conducted a comprehensive review of the affected systems to identify vulnerabilities and strengthen network resilience.

The investigation revealed weaknesses in several operational areas, prompting developers to implement additional safeguards aimed at improving future reliability and reducing the likelihood of similar failures.

The Sui Foundation also disclosed that artificial intelligence tools played a significant role during the troubleshooting process. AI-powered systems assisted engineers by analyzing system logs and collecting network diagnostics, enabling faster identification of the underlying causes.

AI-assisted analysis helped the development team pinpoint the software defects more efficiently, accelerating the deployment of corrective updates and the restoration of services.

Market Impact and Future Improvements

The outages also affected market sentiment surrounding the network’s native token, SUI. During the week of the disruptions, the token experienced a notable decline in value, falling by approximately 17%. The downturn reflected investor concerns over network reliability during the period of repeated interruptions.

With both major software bugs now patched and validators operating normally, network activity has returned to expected levels. The Sui Foundation indicated that future efforts will focus on strengthening stability, improving update procedures, and enhancing protections during validator restarts and software deployments.

By implementing these improvements, the organization aims to minimize operational risks and prevent similar outages from affecting the network in the future.

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