If you are running CWP with CSF then you can find some time server load goes high without any spesicfic reason.
Here is the solution for such case.
Open csf.conf file
#vi /etc/csf/csf.conf
Serarch md5, go to LF_INTEGRITY
# To disable set to “0”
LF_INTEGRITY = “3600”
Replace it with below value
# To disable set to “0”
LF_INTEGRITY = “0”
Save the file and exit.
Restart the server.