Question mod_fcgid problems after update to Plesk Onyx 17.8.11 Update Nr. 16

[snkai]

System: Plesk Onyx 17.8.11 Update Nr. 16 (after update)
OS: ‪Ubuntu 16.04.5 LTS‬

i got in error log

[Thu Aug 16 08:03:56.249463 2018] [core:error] [pid 28745] [client 46.229.168.78:37160] End of script output before headers: index.php
[Thu Aug 16 08:10:06.763882 2018] [fcgid:warn] [pid 31810] (104)Connection reset by peer: [client 188.138.9.207:38270] mod_fcgid: error reading data from FastC                       GI server
[Thu Aug 16 08:10:06.763932 2018] [core:error] [pid 31810] [client 188.138.9.207:38270] End of script output before headers: index.php
[Thu Aug 16 08:16:27.437525 2018] [fcgid:warn] [pid 31712] (104)Connection reset by peer: [client 66.249.76.124:40518] mod_fcgid: ap_pass_brigade failed in han                       dle_request_ipc function, referer: https://www.szenenight.de/cityflash-bremen/index.html
[Thu Aug 16 08:16:29.392158 2018] [fcgid:warn] [pid 29353] (104)Connection reset by peer: [client 66.249.76.124:40526] mod_fcgid: ap_pass_brigade failed in han                       dle_request_ipc function, referer: https://www.szenenight.de/cityflash-bremen/index.html
[Thu Aug 16 08:16:31.166617 2018] [fcgid:warn] [pid 32525] (104)Connection reset by peer: [client 216.244.66.228:40534] mod_fcgid: error reading data from Fast                       CGI server
[Thu Aug 16 08:16:31.166674 2018] [core:error] [pid 32525] [client 216.244.66.228:40534] End of script output before headers: index.php
[Thu Aug 16 08:16:31.336193 2018] [fcgid:warn] [pid 28915] (104)Connection reset by peer: [client 66.249.76.124:40536] mod_fcgid: ap_pass_brigade failed in han                       dle_request_ipc function, referer: https://www.szenenight.de/cityflash-bremen/index.html
[Thu Aug 16 08:18:17.136588 2018] [fcgid:warn] [pid 28746] (104)Connection reset by peer: [client 46.229.168.76:40752] mod_fcgid: error reading data from FastC                       GI server
[Thu Aug 16 08:18:17.136722 2018] [core:error] [pid 28746] [client 46.229.168.76:40752] End of script output before headers: index.php
[Thu Aug 16 08:27:01.883579 2018] [fcgid:warn] [pid 33652] (104)Connection reset by peer: [client 146.247.137.94:42474] mod_fcgid: error reading data from Fast                       CGI server
[Thu Aug 16 08:27:01.883622 2018] [core:error] [pid 33652] [client 146.247.137.94:42474] End of script output before headers: index.php
[Thu Aug 16 08:29:34.754992 2018] [fcgid:warn] [pid 33661] [client 157.55.39.124:42680] mod_fcgid: stderr: PHP Warning:  imagecreatetruecolor(): Invalid image                        dimensions in /var/www/vhosts/szenenight.de/httpdocs/plugins/content/sige/plugin_sige/showthumb.php on line 112
[Thu Aug 16 08:29:34.755025 2018] [fcgid:warn] [pid 33661] [client 157.55.39.124:42680] mod_fcgid: stderr: PHP Warning:  imagecopyresampled() expects parameter                        1 to be resource, boolean given in /var/www/vhosts/szenenight.de/httpdocs/plugins/content/sige/plugin_sige/showthumb.php on line 138
[Thu Aug 16 08:29:34.755033 2018] [fcgid:warn] [pid 33661] [client 157.55.39.124:42680] mod_fcgid: stderr: PHP Warning:  imagejpeg() expects parameter 1 to be                        resource, boolean given in /var/www/vhosts/szenenight.de/httpdocs/plugins/content/sige/plugin_sige/showthumb.php on line 142
[Thu Aug 16 08:29:34.755038 2018] [fcgid:warn] [pid 33661] [client 157.55.39.124:42680] mod_fcgid: stderr: PHP Warning:  imagedestroy() expects parameter 1 to                        be resource, boolean given in /var/www/vhosts/szenenight.de/httpdocs/plugins/content/sige/plugin_sige/showthumb.php on line 144
[Thu Aug 16 08:29:34.755044 2018] [fcgid:warn] [pid 33661] [client 157.55.39.124:42680] mod_fcgid: stderr: PHP Warning:  imagedestroy() expects parameter 1 to                        be resource, null given in /var/www/vhosts/szenenight.de/httpdocs/plugins/content/sige/plugin_sige/showthumb.php on line 145
[Thu Aug 16 08:31:42.354089 2018] [fcgid:warn] [pid 33651] (104)Connection reset by peer: [client 46.229.168.80:43138] mod_fcgid: error reading data from FastC                       GI server
[Thu Aug 16 08:31:42.354131 2018] [core:error] [pid 33651] [client 46.229.168.80:43138] End of script output before headers: index.php

i have try some solutions from the forum
Website shows 500 internal server error on Plesk: mod_fcgid: read data timeout