This happens every time there is a bull run or a flash dump. I think there are reports that even kraken, Robinhood and other bunch of exchanges had similar issues around about the same time
Back in the day when Bitmex had the volumes, it would also completely freeze or crash, but I don't see that problem there anymore.

I experienced one of those outages one time and trust me, it can be so traumatizing, especially in the derivatives markets. Your position gets liquidated even before you blink, and yet you can't close it yourself.