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#11
Local host, a Hostname is the term for the label that is assigned to any device connected to a computer network and is used to identify the device across the web.
Possible some software is accessing internet at the time of CPU activity, Teamviewer has remote access to internet, i am not familiar with Dropbox and how it works exactly but does use your network for file sharing, sync and storage. How about startup items in Task Manager ?
When was last time you did a full system scan for Virus and Maleware ? I see you have AVG is it the full version or free ? Try also running Malwarebytes Antimalware, pick the free version https://www.malwarebytes.org/products/
Just to try to rule out any infections on system. Telling me only 3 third party software products on system ? You have updated important system drivers for this PC from ASUS ?