The Arbitrum network experienced a “partial outage” Friday amid a surge in transaction traffic that impacted the layer 2 blockchain’s sequencer.

Arbitrum’s sequencer stalled “during a significant surge in network traffic” according to posts across the network’s social media on Friday. “We are working to resolve as quickly as possible and will provide a post-mortem as soon as possible,” read a post on Arbitrum’s status webpage.

Sequencers have been likened to an “air traffic control” for deciding which transactions land first on layer 2 networks such as Arbitrum. They’re an essential link between the L2 and and the base chain, Ethereum. But they’re also a single point of failure.

Arbitrum’s sequencer last stalled out in June after a bug created a backlog of unprocessed transactions. That issue was patched in a matter of hours.

The tech issues failed to rattle markets for Arbtirum’s ARB token, which was already trading slightly down for the day.

This is a developing story.

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