Getting "Connection reset by peer" during request to the website with Cloudflare proxy

We have a batch server that tries to reach our API service that uses Cloudflare proxy.
Periodically I can see error logs like this:
reactor.core.Exceptions$ReactiveException: io.netty.channel.unix.Errors$NativeIoException: readAddress(..) failed: Connection reset by peer

I mean that not every request is dropped, but some of them return this error.

If I disable proxy over Cloudflare everithing is fine.

What could be wrong?

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