Sui Mainnet Stalls Again With Second Outage in Two Days

High attention and emotional sentiment detected.

The announcement came just hours after the team declared the network back online following a six-hour halt on May 28. That earlier outage traced back to a crash bug in the gas-charging logic from the v1.72 release.

Now, with a second stall confirmed, questions about Sui’s reliability are growing louder across the crypto community.

What Happened on May 28

The Sui Network team announced the first stall around 14:29 UTC on May 28. Validators stopped producing new checkpoints, which effectively froze transaction finality on the network.

The Sui Core team traced the issue to a gas-charging logic crash in the v1.72 upgrade. After deploying a fix, activity resumed around 20:32 UTC. In total, the network stayed down for roughly six hours.

“Activity on Sui mainnet has resumed after a halt due to a crash bug in the gas charging logic introduced by the 1.72 release,” the team posted on X.

Sui Mainnet Stalls Again as Validators Halt Block Production

Early on May 29, Sui’s official status page showed that more than two-thirds of validator stake had upgraded. The network appeared to run normally.

Then, at 12:19 UTC, the team confirmed a new disruption as Sui Mainnet Stalls Again. “Sui mainnet is currently experiencing a network stall. Network activity may be paused at this time,” the announcement read.

The Sui Core team said it was actively investigating. The team has not yet confirmed a root cause. The status page currently lists this as a “Major Outage (Validators)” with an unresolved “Mainnet settlement” incident.

How a Sui Network Stall Works

On Sui, a network stall means validators cannot certify new checkpoints. Checkpoints are Sui’s equivalent of finalized blocks in other Layer 1 chains.

When a stall occurs, transaction finality halts. New transactions time out instead of reaching confirmation. The chain does not fork, though, and no double-spends are possible by design.

RPC endpoints may still serve reads from the last certified state during a stall. So wallets and explorers can show balances, but new activity cannot process.

Sui runs on the Mysticeti consensus mechanism, an upgrade from the earlier Narwhal and Bullshark system. Edge-case bugs in transaction processing or accumulator logic have triggered past stalls under specific conditions.

Market and DeFi Impact

SUI traded around $0.92 to $0.93 during the May 28-29 period, according to CoinGecko data. The token dropped roughly 2% to 8% intraday on May 28 when the first stall hit.

Total value locked across Sui DeFi protocols sat at $536.56 million, down 2.20% over 24 hours, per DefiLlama. Stablecoin market cap on the chain reached approximately $452.9 million.

Key protocols like Cetus, Suilend, and Scallop faced temporary freezes during the stall windows. On-chain data from Suiscan showed transactions per second dropping to zero during both stall periods.

A Pattern of Outages

This is not Sui’s first encounter with downtime. In November 2024, a scheduling bug caused a roughly two-hour outage. In January 2026, a consensus divergence triggered a six-hour halt.

The May 28 incident added to that list. Now, with a second stall on May 29, the pattern draws comparisons to Solana’s early outage history.

CoinDesk framed the May 28 event as “another network outage.” The Block and Crypto.news both reported on consecutive stalls and quick-fix deployments. Wu Blockchain highlighted “two consecutive days” of disruption.

Community Reacts With Frustration

Social media reaction came swiftly and ran largely negative. “SUI has proved itself now as a total unreliable blockchain,” one user posted on X. Another called the situation “two consecutive days of outage” and questioned the chain’s readiness.

Memes and comparisons to Solana’s past outages spread quickly. Some community members expressed sympathy for the engineering team, noting the rapid response times. Others pushed back harder, calling the infrastructure unreliable.

The dominant narrative forming on social media: Sui delivers high performance when running, but uptime issues persist.

What Remains Unknown

Several critical details are still missing. The team has not disclosed the exact root cause of the May 29 stall. Whether it relates to the same v1.72 gas bug or a new issue entirely remains unclear.

The team also has not confirmed whether validators dropped any transactions or simply queued them during the stall. Mysten Labs promised a full post-mortem but has not yet delivered one.

As of the latest available data around 13:12 UTC on May 29, the team has shared no specific timeline for resolution.

What Comes Next for Sui

The Sui Core team faces pressure to deliver a thorough post-mortem and prevent a third consecutive disruption after Sui Mainnet Stalls Again this week. Validator uptime historically sits at 99.68% over 90 days, according to the status page. Two back-to-back stalls put that track record at risk and raise fresh questions whenever Sui Mainnet Stalls Again unexpectedly.

For traders and DeFi users on Sui, no funds appear lost. Transactions should resume once validators reach consensus again. The team’s response speed on May 28 suggests resolution could come quickly, even after Sui Mainnet Stalls Again for a second consecutive day.

Still, consecutive-day outages create real reputational damage for a chain competing against Solana, Aptos, and other high-throughput Layer 1 networks. Builders, investors, and competitors will closely watch the upcoming post-mortem as Sui Mainnet Stalls Again becomes a major talking point across the ecosystem.