520 error: How to Fix?

I am face a 520 error Web server is returning an unknown error on my website, how to fix it?

Error 520 occurs when the origin server returns an empty, unknown, or unexpected response to Cloudflare . A quick workaround while further investigating 520 errors is to either make the record DNS-only in the Cloudflare DNS app or temporarily pause Cloudflare.

Recently my hosting provide me a new web IP Address, so I changed Cloudflare DNS to new IP Addess. But after some time it’s automatically changeing with old IP. Why & Maybe this is the reason?

I’ve also tried pause Cloudflare but it didn’t solve it. now what i can do?

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