Failed to read FastCGI header

The first error message I got , then I increased the max execution time to 60 ( some content got uploaded)

[Thu Sep 13 01:13:38.258363 2018] [proxy_fcgi:error] AH01071: Got error 'PHP message: PHP Fatal error:  Maximum execution time of 30 seconds exceeded in /core/includes/errors.inc on line 203\n', 

Then I got the second messages about failed to read fast cgi header ( some content got uploaded )
This could be related to Buggy PHP Code

[Thu Sep 13 01:39:11.277263 2018] [proxy_fcgi:error]  AH01067: Failed to read FastCGI header
[Thu Sep 13 01:39:11.277336 2018] [proxy_fcgi:error] [pid 6222:tid 139929393907456 (104)Connection reset by peer: [client client x.x.x.x:62000] AH01075: Error dispatching request to : 
[Thu Sep 13 01:39:25.270844 2018] [proxy_fcgi:error]  AH01067: Failed to read FastCGI header, referer: https://client.com/admin/config/content/contentimport
[Thu Sep 13 01:39:25.270929 2018] [proxy_fcgi:error] [pid 6967:tid 139722456442624] (104)Connection reset by peer: [client x.x.x.x:62000] AH01075: Error dispatching request to : , referer: https://client.com/admin/config/content/contentimport
[Thu Sep 13 01:39:37.269083 2018] [proxy_fcgi:error]  AH01067: Failed to read FastCGI header, referer: https://client.com/admin/content
[Thu Sep 13 01:39:37.269138 2018] [proxy_fcgi:error] (104)Connection reset by peer: [client x.x.x.x:62000] AH01075: Error dispatching request to : , referer: https://client.com/admin/content