The site down many time, check WHM server status, Apache server down.

Dear Sir,

The site down many time, check WHM server status, Apache server down.

Memory and Disk Usage OK

Is may be error by modify header information ?

How to fix it?

Thanks!

Warning: Cannot modify header information -
headers already sent by (output started at /home/wpmysite/public_html/wp-content/plugins/alphabetic-pagination/functions.php:330) in /home/wpmysite/public_html/wp-content/plugins/stop-spammer-registrations-plugin/stop-spammer-registrations.php on line 93