Coinbase (COIN) reported a multi-hour disruption to crypto trading on Thursday, which the Nasdaq-listed exchange attributed to an outage at Amazon Web Services. The incident drew criticism as Coinbase continues to grapple with declining trading activity, quarterly losses, and staff layoffs.

The crypto trading platform said users were unable to transact across web and mobile services after failures hit multiple AWS availability zones in the U.S. Eastern Region, located in Virginia.

“Coinbase experienced service disruptions due to increased temperatures in the affected AWS service,” the trading platform said in a status-page update. Trading was later restored after markets were briefly placed into a “cancel only” mode.

“This…