Sui, a layer-1 blockchain network developed by Mysten Labs, faced significant disruptions on consecutive days in late May 2026, raising questions about its operational stability despite its advanced architecture.
On May 28, 2026, the Sui mainnet experienced a major “network stall,” halting block production for approximately six hours. The issue stemmed from a consensus commit bug introduced in a recent software release (version 1.72), which caused validators to crash and prevented new checkpoints.
Sui’s official status page flagged it as a major outage starting around 07:15 PDT, with the core team confirming on X that transactions were paused while they worked on a fix.
Validators coordinated to apply a patch, and over two-thirds of the stake upgraded, restoring the network by around 8:32 p.m. UTC. No user funds were lost, thanks to built-in safety mechanisms that prevented inconsistent states.
Just hours later, on May 29, another stall was reported around 12:19 p.m. UTC, with the status page again indicating unresolved mainnet settlement issues and no new blocks for over an hour. The core team promptly investigated, and activity resumed relatively quickly in this instance.
The blockchain’s network status page currently shows that 2/3 of stake have upgraded to the fix and the network is online while the team is monitoring for any further issues.
These back-to-back incidents mark the second major outage of 2026 for Sui, following a similar six-hour consensus divergence event in January. Earlier issues, including a November 2024 outage tied to congestion control, highlight a pattern of technical hiccups despite Sui’s object-centric model, parallel execution, and Move programming language designed for high throughput and security.
The disruptions had an immediate market impact. The native SUI token dropped about 8% in price amid the May 28 halt, trading near $0.91 as broader crypto markets showed mixed performance.
Sui has positioned itself as a scalable platform for DeFi, gaming, and institutional use, boasting millisecond finality and features like private stablecoin transactions.
However, repeated downtime risks eroding developer and user confidence in its reliability for production environments. As the network processes significant on-chain value, sustained uptime will be critical for long-term adoption.
This is a developing story and more information will be added as the event unfolds.
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