The Sui mainnet experienced three outages between May 28th and 29th, totaling over 15 hours of downtime. The Sui Foundation stated that user funds were unaffected during the outages, and submitted transactions were not rolled back.

Cause of the fault

Engineers traced the first two failures to a crash vulnerability. The problem lay in the interaction between the gas billing logic and Sui version 1.72. This version added an address balance function, but the new function conflicted with the existing gas calculation process, causing the verification node to stop running.

The foundation also acknowledged that the team had used a temporary fix to restore the network as quickly as possible. This approach introduced higher risks, and the developers subsequently pursued a more robust solution.

Prices weakened in tandem

SUI's price has fallen significantly over the past week, dropping approximately 18% in seven days, and is currently trading at $0.86. On Monday, the overall crypto market declined, with Bitcoin also falling to a near two-month low, putting continued pressure on SUI.

Reliability pressure remains

This marks the third major stability issue Sui has experienced since its mainnet launch in 2023. Previously, Sui encountered a transaction scheduling vulnerability in November 2024 and a consensus divergence in January 2026, resulting in outages of approximately 2 hours and 6 hours respectively.