Recurring search error in Activity Log
Using Jamroom
Those time slots are too regular. They are all on either a 5 min or a ten min mark. There are 3 ip addresses that repeat over and over.
Turn on the 404 Not found error logger.
ACP -> CORE -> SYSTEM CORE -> GLOBAL CONFIG -> GENERAL -> log 404 not found
That will tell us if its a spam bot throwing weird URLs at your system hoping to find a weak path in.