Increasing 500 errors

Hello, I got a message from google:

https://example.com/: Increase in server errors (error code 500)

So I asked my hosting provider and got this error logs as a reply.

Anybody know what does it mean and how fix it?

[time date] [warn] (103)Software caused connection abort: mod_fcgid: ap_pass_brigade failed in handle_request function
[time date] [warn] (103)Software caused connection abort: mod_fcgid: ap_pass_brigade failed in handle_request function
[time date] [warn] (103)Software caused connection abort: mod_fcgid: ap_pass_brigade failed in handle_request function
[time date] [warn] (103)Software caused connection abort: mod_fcgid: ap_pass_brigade failed in handle_request function

[Wed Jan 21 01:56:22 2015] [warn] mod_fcgid: stderr: PHP Warning: php_uname() has been disabled for security reasons in /var/www/vhosts/example.com/httpdocs/wp-admin/includes/class-pclzip.php on line 5672
[Wed Jan 21 01:56:22 2015] [warn] mod_fcgid: stderr: PHP Warning: php_uname() has been disabled for security reasons in /var/www/vhosts/example.com/httpdocs/wp-admin/includes/class-pclzip.php on line 5672
[Wed Jan 21 01:56:22 2015] [warn] mod_fcgid: stderr: PHP Warning: php_uname() has been disabled for security reasons in /var/www/vhosts/example.com/httpdocs/wp-admin/includes/class-pclzip.php on line 5672

Thank you very much!