CPU 100% or more


I have installed cloud9 to standalone centos7 with 4GB RAM and 8 core processors.
Currently only one user is using it. But few times in a day load in the server goes more than 100% and c9 doesn’t load.
So i have to stop and start process to make it work. Is there anything i am doing wrong?
its c9 is used for PHP code and we donot run it from console, have seperate url to view output.
Any help will be highly appreciated.