Arbitrum said Robinhood Chain did not experience downtime during a September 4, 2026 episode that reports characterized as an approximately 14-minute block-production halt. Layer 1 blob-market conditions delayed transaction-batch publication to Ethereum, but direct user transactions continued without delays, Arbitrum said. A report had said transactions and smart-contract operations were left unconfirmed from about 12:57 p.m. UTC, while Robinhood had not disclosed a cause or recovery timeline. Robinhood shares fell as much as 5.1% in Friday trading before partially recovering, although available data did not establish that the blockchain episode caused the move. On September 5, memecoins associated with the Robinhood ecosystem fell broadly and Robinhood Chain recorded $21 million in net outflows over 24 hours, the largest among chains that day. CASHCAT fell more than 19% to a $214 million market capitalization, while newer token MEME dropped more than 50% in six hours to $39 million.