So, after around 5 minutes of idle, CPU goes to ~12% usage by process SYSTEM (PID 4), more specifically by thread called ntoskrnl.exe!ExQueueWorkItem+0x400 and after some time it ends by itself but it happens everytime I left my PC idle. If any key is pressed or the mouse moved, this stops immediately.
I have this PC for a year already and never seen this before last couple of months. So, i did clean installation of windows about two weeks ago to solve this and there was not such a problem since then but today it appeared again. I didn't make any changes in software/hardware.
I have all drivers updated, Windows 10 Home, Fall Creators Update with latest build. Despite this everything is working fine but this problem is annoying.
So what should I do?
Edit: i found out using taskschedulerview that everytime this cpu usage happen there are several processes every time the same
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