The Sui layer-1 blockchain experienced another disruption on Friday, causing a “network stall” that temporarily halted block production before normal activity resumed, according to the Sui team. The network disruption lasted for over three hours and 30 minutes at the time of publication, according to the Sui network’s uptime dashboard.
Network activity “may be paused,” the Sui team said. The last block before the disruption was produced at about 11:51 UTC on Friday, with activity resuming at about 3:30 UTC. The Sui team said in an update: “Both today’s and yesterday’s halts are due to the interaction of the 1.72 release, which introduced address balances and gas charging logic. Yesterday’s implemented fix was an interim measure designed to restore functionality to the network.”
The interim fix had a “low probability” of causing a network disruption, and the long-term software fix has now been implemented by a majority of Sui validators. The incident follows several major disruptions and network outages, including Thursday's outage, which caused a nearly six-hour outage due to a “crash bug in the gas charging logic,” according to the team. The crash was the second major network disruption in 2026.
Background on Sui Network
Sui is a high-throughput smart contract blockchain network developed by Mysten Labs. It uses a novel object-centric data model and the Move programming language to achieve high performance. The network is designed for low latency and high capacity, making it suitable for decentralized finance (DeFi) and gaming applications. However, like many decentralized networks, it has faced challenges with stability and upgrades.
The January 2026 outage was due to a consensus bug that halted block production for over six hours. Validators submitted conflicting transactions to the protocol’s checkpoint mechanism, preventing the network from reaching the necessary threshold for consensus. The Sui team emphasized that user funds were never at risk and no certified transactions were rolled back. The issue was detected and contained by Sui’s checkpoint certification and quarantine mechanisms.
Thursday's crash bug was related to gas charging logic introduced in the 1.72 release. Gas charging is the process by which transaction fees are calculated and deducted. A bug in this logic caused validators to panic, halting block production. The team deployed an interim fix that restored functionality, but the same bug triggered a stall again on Friday. The long-term fix, now implemented by a majority of validators, is expected to prevent further disruptions.
Impact on the Ecosystem
Network outages can have cascading effects on decentralized applications, exchanges, and users relying on the blockchain for transactions. During the outages, transaction processing was paused, which could affect DeFi protocols, NFT marketplaces, and other dApps. However, the Sui team confirmed that no user funds were lost and all certified transactions were eventually processed.
The disruptions also highlight the challenges of upgrading permissionless networks. Unlike centralized systems, blockchain networks must coordinate among a distributed set of validators to deploy fixes. This process can be slow and sometimes introduces new issues. The Sui team’s communication during both outages was transparent, providing regular updates and a post-mortem report for the January incident.
In comparison, centralized service providers like exchanges can suffer outages due to infrastructure failures. In May 2026, Coinbase experienced a temporary service disruption due to an Amazon Web Services (AWS) outage, forcing it to switch markets to an auction mode before restoring full service. Blockchain networks have additional failure points due to their decentralized nature, but they also offer censorship resistance and user control.
Technical Details of the Bug
The crash bug in the gas charging logic was triggered by a specific sequence of operations that caused an unexpected state in the validator software. Gas charging is a critical component of blockchain operations because it prevents spam and ensures that validators are compensated. The bug was introduced in version 1.72, which aimed to improve address balance tracking and gas fee calculation. The interim fix involved a soft fork that temporarily disabled certain operations, but it had a low probability of causing a stall under heavy load.
The long-term fix involves a more comprehensive patch that addresses the root cause of the bug. Validators were required to upgrade their software to the new version. As of Friday evening, the majority of validators had implemented the fix, and network stability was restored. The Sui team advised users and dApp developers to monitor the network closely and report any anomalies.
Historical Context of Network Outages
High-throughput smart contract blockchain networks have historically faced challenges with outages and performance issues. Solana, for example, has experienced multiple outages due to consensus failures and network congestion. Ethereum has also faced periods of high gas fees and network congestion, though full outages are rare. Sui’s object-centric architecture theoretically reduces some of the inefficiencies of account-based models, but it introduces new complexities in state management and transaction ordering.
The January 2026 outage was the first major disruption for Sui. The post-mortem report highlighted that the issue was not due to congestion but rather a bug in the consensus mechanism. Validators produced conflicting checkpoints, and the network stalled until a manual intervention was performed. The team at that time noted that user funds were never at risk, a key reassurance for the ecosystem.
Thursday and Friday's outages are the second and third major disruptions this year. They underscore the risks associated with rapid protocol upgrades. The 1.72 release was likely rolled out to improve performance or add features, but the unforeseen bug caused significant downtime. The Sui team’s handling of the situation, including clear communication and prompt fixes, has been praised by some in the community, but questions remain about testing and code quality assurance.
In the broader crypto industry, network outages are often seen as growing pains. As blockchain networks mature, they must balance innovation with stability. Decentralized networks are particularly vulnerable because changes require coordination among many independent validators. However, the transparency of blockchain also means that issues are quickly identified and addressed.
For investors and users, the value of the native token SUI can be impacted by such outages. Following Thursday's outage, SUI experienced volatility but later rallied 50% amid staking moves and zero-fee stablecoin initiatives. The market's resilience suggests that long-term confidence in the Sui network remains strong.
Looking ahead, the Sui team has committed to improving its testing and deployment processes to avoid similar incidents. The implementation of the long-term fix and the validator community's rapid upgrade demonstrate a robust response mechanism. However, the network's reliability will be crucial as it competes with other layer-1 blockchains for DeFi and NFT market share.
In conclusion, the Sui network's repeated outages highlight the challenges of maintaining a low-latency, high-throughput decentralized network. While the team has responded effectively, the incidents serve as a reminder of the complexities involved in blockchain protocol upgrades. Users and developers should remain vigilant and stay informed about network status and any planned changes. The Sui ecosystem continues to grow, and its ability to overcome these technical hurdles will determine its long-term success.
Source: Cointelegraph News