I restarted the server and didn't have the issue for around 11 hours, now it just happened again, the sites stopped working and when I restarted httpd I got the same error as above, Looked at the link you sent and this is the response I got:
Is this correct?
I upgraded to Panel version 11.5.30 Update #2 today and now six times my sites have become unaccessible. I then have to restart httpd to get it working but get this error five or six times before it starts again:
Any ideas why this might be happening?