Starknet, an Ethereum layer‑2 scaling network, experienced its second major network disruption in 2025, requiring a block reorganization to rollback some activity. The outage was caused by a discrepancy in the network state between the blockifier execution layer and the proving layer. The incident prompted testing and code audits to prevent future issues.

In September 2025, StarkNet faced a serious outage lasting over five hours due to a sequencer bug following a major protocol upgrade called Grinta. Block production halted, and two chain reorganizations were executed to restore the network. Users had to resubmit transactions, impacting traders and investors needing time-sensitive actions.

Read more at Cointelegraph: Starknet Team Outlines Root Cause of Latest Network Outage