The organization overseeing the Sui blockchain says it has implemented a significant network upgrade aimed at preventing a repeat of the technical failures that recently interrupted operations for more than 15 hours over a two-day period.
The move comes after a turbulent week for the blockchain, which suffered three separate outages that temporarily halted network activity and raised concerns among users and developers.
According to Sui’s network status records, the first disruption occurred on Thursday and lasted nearly six hours.
Two additional outages followed on Friday, one stretching for more than eight hours and another lasting approximately 43 minutes. By Monday, the network’s systems had returned to normal operations.
Foundation Identifies and Fixes Key Software Problems
In an update published over the weekend, the Sui Foundation said engineers had deployed fixes targeting the underlying software defects responsible for the interruptions.
The nonprofit organization also outlined areas requiring further improvement, including stronger failure-isolation mechanisms, enhanced resilience during epoch transitions, and expanded use of artificial intelligence-powered tools to assist with diagnostics and operational monitoring.
According to the foundation, AI-driven systems played a role in investigating the incidents by helping teams analyze validator logs, gather performance metrics, and identify the source of failures more efficiently.
The organization stated that validators have now resolved the issues linked to both the gas-processing flaw and a separate bug involving the network’s randomness state.
As a result, blockchain activity has resumed without further interruptions.
User Funds Remained Safe During Downtime
Despite the prolonged outages, the foundation emphasized that no customer assets were endangered.
It also said the blockchain did not reverse or roll back any transactions that had already been finalized before the network went offline.
The assurance is intended to ease concerns among users following the latest disruptions, which temporarily prevented normal transaction processing across the ecosystem.
Recurring Reliability Challenges Continue
The recent incidents are not the first time Sui has faced operational difficulties.
Earlier this year, the network experienced another outage that kept the blockchain offline for more than six hours.
In November 2024, a separate technical issue caused validators to become trapped in a crash loop, resulting in approximately two and a half hours of downtime.
Despite these setbacks, Sui remains one of the larger blockchain ecosystems in the decentralized finance sector.
Data from DeFiLlama ranks it as the 13th-largest blockchain by total value locked, with roughly $519 million secured across the network and 137 active protocols operating on the platform.
Software Release Introduced Critical Bugs
The foundation traced the latest outages to flaws that were introduced in version 1.72 of the network’s software.
One of the defects affected the blockchain’s gas-charging mechanism.
Under certain conditions, the network deducted transaction fees before ultimately rejecting transactions because of insufficient balances.
This process generated negative account balances, triggering system crashes that brought network operations to a halt.
Engineers later introduced a temporary remedy to address the original issue and restore functionality.
However, that interim solution contained a separate weakness that, while considered unlikely to occur, eventually contributed to the third outage.
The foundation acknowledged that the stopgap measure carried a known risk of causing another network halt while developers worked toward a permanent fix.
Token Price Slides Following Technical Setbacks
The outages also weighed on market sentiment surrounding Sui’s native cryptocurrency.
Before the first interruption on Thursday, the SUI token was trading near $0.99. Since then, the asset has fallen by roughly 11%, changing hands at around $0.88 by Monday.
The decline contrasts sharply with the token’s performance earlier in May, when it surged approximately 50% to reach $1.41. That rally was fueled by a series of favorable developments, including news that a Nasdaq-listed company had committed a substantial portion of the token supply to staking activities.
Long-Term Ambitions Remain Intact
Sui launched its mainnet in May 2023 with ambitions of becoming a highly scalable blockchain capable of supporting rapid transaction processing for mainstream financial applications and institutional users.
While the latest outages highlight the technical challenges that can accompany rapid growth and software upgrades, the foundation maintains that the network’s recent fixes have addressed the immediate causes of the disruptions and restored normal operations across the ecosystem.
