The brief report says Sui attributed three mainnet outages to upgrade-related software bugs, including one fix the network already understood could trigger a halt.
Sui said three mainnet halts were caused by bugs tied to network upgrades, according to the provided report. The note also says one of the fixes was deployed despite a known risk that it could halt the chain. Mainnet (a live blockchain network) interruptions can stop transaction processing and disrupt onchain activity until validators restore the network. The source does not provide dates, technical details, or the duration of the outages.