Cloudflare 502 and 504 error

One of our website is having issue after connecting through the cloudflare proxy.

The site keeps throwing 502 and 504 error every now and then. But upon removing the proxy, the site works fine and we don’t get such errors.

Not sure what caused this as the server seems to be working fine and we don’t have any errors in the log file either.

May I ask have you tried checking with the steps from below article?:

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