The BitMEX [Testnet] Trading platform experienced instability on 5 January 2021 between 10:30 UTC and 11:40 UTC. The [Testnet] platform was put into maintenance mode to prevent an inconsistent experience for users while we triaged the issue. We identified the root cause of the instability as an intermittent storage subsystem problem in our cloud provider hardware, which resulted in unstable performance and occasional system pausing. Though the storage sub-system automatically recovered after a period of time, as a precaution we failed over to another node in a controlled manner. We apologise for the inconvenience this may have caused. Please contact Support should you have any further queries.