Re;
Problem solved. @gallaxymv6 has used fcgid on a vm with only one processor and only 480 MiB ram. Of course, this is not sufficient. The problem has occurred during logs rotation which involves an Apache restart. I've been able to reproduce by running ( cd /etc/logrotate.d && logrotate --force apache2 ) Indeed, the cgi processes were unable to die and therefore, Apache was unable to restart (this is linked to the fcgid apache module). This has been solved by using ITK in place.
For all others: You should know that usage of i-MSCP on a vm with few memory is a mess. It's not i-MSCP the problem, it's the number of services which are running.
