Sui's mainnet went down again on Friday morning, May 30, 2026, hours after validators had already scrambled to patch a crippling bug introduced earlier in the week. The network's official X account announced at approximately 06:00 UTC: "Sui mainnet is currently experiencing a network stall."
It was the second outage in 24 hours. Thursday's halt (May 29) had lasted more than five hours before an interim patch was deployed — but that patch shipped with what Sui's team described as "a known issue with a low probability of causing a halt." On Friday, that low probability hit.
The root cause: an interaction between the v1.72 release, which introduced a feature called Address Balances, and the protocol's gas charging logic. The two subsystems conflicted in a way that stalled consensus. Friday's resolution came only after validators rolled out a longer-term fix. The network confirmed the same day: "The long-term solution has been implemented by validators, fully addressing known issues caused by the original bug, and network activity has resumed."
The pattern is not new. Sui suffered a comparable outage in January 2026, which caused roughly six hours of downtime. That makes three significant network stalls this year. For a chain that has marketed itself on high-throughput and reliability — often in direct contrast to Solana's early outage history — the recurring halts are a structural credibility problem. A full postmortem had not been published at time of writing.
The on-chain data reflects the stress. Sui's total value locked stood at $515,639,091 on May 31, down from $585,991,059 one week earlier — a 12% decline over the period that encompasses both outages. SUI, the network's native token, was trading at $0.885273 as of 21:33 UTC on May 31 (CoinGecko), giving it a market cap of approximately $3.55 billion.