524 and 521 error

I have 3 domain listed here www.daluitechnology.com www.dalui.in www.fbshop.in
I am getting error 524 very often and some times 521 as well.
All this happening at same time .
Is it because of putting 3 domain in a single cloudflare account or something else .
Suggest me how to get rid of it.
I am loosing my business due to this.
Suggestions are welcome at [PII redacted by staff]

The amount of domains on your account doesn’t affect individual domain performance. 5xx errors are due to problems with your server not letting Cloudflare connect to it:

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