Do you pirate games? You can tell me in PM if you're worried about admitting it.
You may have one of the hardcore viruses that hijacks your unit to mine bitcoins.
Take your unit offline and watch if it happens again.
If it happens while online, check your wireless send / receive at how much data is leaving the unit on idle.
P.S I don't have Remote Desktop Services either. When CPU is running 100 try kill that process thread with right click + stop
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