Two domains on one server, periodicly get Error 522

Hi, I have two domains pointed to the same server (one IP). And mostly they work, but sometimes I get error 522, and after a half a minute they work again.

How do I test and resolve this.

One more thing, when it happened, i pinged IP of the server and it was normal, then i pinged domains witch were replied from Cloudflare IP ranged, and thy were OK. But I was still getting error 522 in browser

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