Getting 502 from cloudflare on all sites

Hi, i have 10 websites on same host, and all trafic on sites going trought cloudflare. For some reason im getting 502 error some times randomly on every site. Tried to search in google and on cloudflare forum for solution but nothing worked. Do you have suggestions how to fix this issue?

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Here are some tips. If the error Page is not Cloudflare branded, it’s an issue on your host: