Does this happen when you unplug ethernet cable(and wait for a few minutes)?
Maybe your computer becomes a part of botnet for hacker wars between usa and russia when your windows10 gets an update from a fake server? There are people intentionally using load-test software on game servers such as counter strike (to put load on server so it is loaded more than usual) maybe you are a victim to one of those if they got your mac address or somehow your internet traffic?
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Press Ctrl+Shift+Esc to launch Task Manager, then, click the Processes tab and choose "Show processes from all users". You should now see everything running on your PC at the moment. Then click the CPU column header to sort by CPU usage, and look for the process that's the most demanding, click detail tab and select the program, right click on it and set priority to low.
Now right-click the process again, select Set Affinity, and clear all but one of the CPU boxes. The "Processor Affinity" setting tells Windows which CPU cores are allowed to run a particular application, and so by restricting it to one you'll free up the others for the rest of your programs.
Also, make sure Windows is up to date and all the drivers installed, try updating the BIOS to the latest version from your motherboard manufacturer website.
I hope this can help.