[bitfolk] Out of memory: Kill process 11946 (httpd) score 28 or sacrifice child

Hi guys, I seem to be having a bit of trouble with my VPS at present... It's CentOS 6.5, running ZPanel and Wordpress... That's it. When I hit "Post" on a Wordpress post, the httpd falls over saying, something like: Out of memory: Kill process 11946 (httpd) score 28 or sacrifice child Killed process 11946, UID 48, (httpd) total-vm:85420kB, anon-rss:6864kB, file-rss:56kB It has 480MiB RAM. I can't understand why submitting a Wordpress post is making the httpd use so much memory that it falls over. Having to reboot the VPS each time I make a Wordpress post isn't ideal. Has anyone seen anything like this before?