Broken pipe: mod_fcgid

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(32)Broken pipe: [client x.x.x.x:53208] mod_fcgid: ap_pass_brigade failed in handle_request_ipc function, referer: https://mysite.com/wp-admin/admin.php?page=wpfastestcacheoptions

Hi all. I get that every time I clear cache or submit WPFC settings. All seem to work regardless but still would like to know how to get rid of this error/warning.

Running: Apache/2.4.6 (CentOS), PHP 7.0.14, 5.5.50-MariaDB

I haven’t modified any mod_fcgid settings except increased FcgidBusyTimeout a bit for one project, all the rest should be at default.

Any ideas where to start? I actually tried to increase few things in config, like FcgidMaxRequestsPerProcess / PHP_FCGI_MAX_REQUESTS and few others according to couple of stackoverflow posts, but no luck getting rid of this.

Thanks!