I asked them root cause of this load spikes and they said, the Joomla site is the culprit.
And replied this,
I took a look at the slow log for MySQL. It looks like most of the reported slow logs are related to user/database: joomcd_xxxx It is not the only one, but it is the majority.
That may give an indication as to why the Joomla site is being listed as a high resource usage.
So, how do we debug whats going on and how to fix it ?
I cant imagine such a small Joomla site trying to take down the server 5 times every hour and Im losing business, clients , money and all of my time on it.