Error 520 Web server is returning an unknown error [Getting this error On and OFF]

In My website On and Off i am getting Error 520 Web server is returning an unknown error.

I am getting this error across multiple pages On and OFF on my website.

I have checked in Cloudflare Error analytics and it showed me this error has been recorded by more than 3000 times in last 24 hours.

Request, experienced please suggest me what to do, currently i am using cloudflare Free account.

Detail error is as follows:

Error 520

Ray ID: 61e3623bcb7dd9d0 • 2021-02-08 06:44:43 UTC

Web server is returning an unknown error

A 520 error occurs when the connection started on the origin web server, but that the request was not completed. The most common reason why this would occur is that either a program, cron job, or resource is taking up more resources than it should causing the server not to be able to respond to all requests properly.

Review the Quick Fix Ideas in this Community Tip for troubleshooting suggestions.

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