Thanks for your answer Saltgrass.
First of all let me tell you that after restarting in safe mode the CPU issue doesn't seem to be happening anymore, can it be solved just by starting in safe mode? (I didn't use safe mode for years, I completely forgot that it existed)
I will report back if the problem shows up again.
P.S. I will add a couple of things:
It just started to be really cold here in Argentina (winter is coming
) so external heat is ruled out. I also checked the fans and the thermal paste and it all seems to be O.K.
About witch process was causing it, it's a total random process. Let's say it's SearchIndexer.exe... if I kill that process services.exe automatically takes it's place at the top of the list with a 80% use of CPU and the second in the list uses the remaining 20%
Again Saltgrass, thanks for your time.