When Fast Isn’t Enough: What Sui’s Network Outages Mean for Crypto

Last week offered a timely reminder that speed and reliability are not the same thing. According to a recent analysis by Sandmark, Sui – a blockchain that has attracted significant attention for its performance capabilities, suffered three separate network outages within the space of 36 hours on May 28–29, leaving users unable to transact and raising real questions about its dependability.

To understand why this matters, it helps to know what Sui is designed to do. Unlike older blockchains that process transactions one at a time, Sui was built to handle many transactions simultaneously, making it faster and theoretically more scalable. It has been positioning itself as infrastructure for everyday applications like payments, gaming, and financial tools. That ambition makes reliability not just desirable, but essential.

The outages were caused by software bugs introduced in a recent update. The first two halts stemmed from a flaw in how the network handled certain payment transactions, which caused it to crash. A quick fix addressed the immediate problem but missed a closely related issue, triggering a second shutdown. A third, separate bug then caused the network to stall again during a routine system transition. Three outages in 36 hours — each from a different cause.

The good news is that no user funds were lost. But as Sandmark’s analysis highlights, that’s really the bare minimum expectation. When a blockchain goes offline, users can’t move their money, adjust investments, or access applications built on the network — and that has real financial consequences regardless of whether balances are technically preserved.

The outages at the end of May are an unfortunate turnaround for Sui, who had seen their token making impressive gains at the beginning of the month based on growth enthusiasm surrounding staking on the blockchain. Sui had also just launched on their testnet a platform designed to support prediction markets and derivatives trading.

The bigger question after such a mixed month, is what this means for Sui’s reputation and price going forward. Other major blockchains have faced similar incidents and recovered, but trust takes time to rebuild. For crypto to fulfil its promise as serious financial infrastructure, the networks underpinning it need to be as dependable as the systems they aim to replace.