KuMEX Contract Trading System Will Be Suspended for 60 Minutes for Upgrade:

To further improve the performance of the contract trading system, KuMEX has scheduled a system upgrade at 07:00 on May 8, 2020 (UTC).

Read more about this on:
https://www.kucoin.com/news/en-kumex-contract-trading-system-will-be-suspended-for-60min

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KuMEX Contract Trading System Upgrade Completed

The upgrade to the KuMEX system is complete. Trading will resume at 07:30, May 8, 2020 (UTC).

See the official announcement here:
https://www.kucoin.com/news/en-kumex-contract-trading-system-upgrade