The Sui Foundation has released a technical report detailing the root causes of three consecutive mainnet halts on May 28–29. According to the document, the incidents stemmed from vulnerabilities introduced after upgrading the software to version 1.72. The first outage, lasting approximately six and a half hours, was triggered by a bug in the Address Balances feature: the gas deduction mechanism malfunctioned, causing transactions to fail due to apparent insufficient funds while the network continued processing them, resulting in negative balances and preventing validator reconciliation.

The second disruption resulted from deploying an interim patch to address the initial issue: the team acknowledged awareness of a "low probability" of recurrence but consciously accepted this risk to expedite network restoration. The third halt had a distinct origin: during node restarts to apply the final fix, a latent bug related to preserving random number generation settings across epochs activated, preventing validators from finalizing epoch data and halting the network again.

Sui Foundation representatives confirmed that user funds remained secure throughout and confirmed transactions were not rolled back. All identified issues have now been resolved, with the network operating normally. To accelerate log analysis and metrics collection during the incidents, the team successfully leveraged AI agents. Notably, this follows a separate six-hour outage experienced by the Sui blockchain in January.