When i bought PS4 i noticed that after a few minutes of playing Killzone my PS4 is turning in to hairdryer.
I could send it to Sony service but i stated that if console works the problem must be in cooling system.
I dissembled console to pieces and my suspicions was right. The thermal paste was badly placated and thermal pads were somewhere but not on the memory chips.
I bought proper things, which i consider as god and i get to work.
Because used thermal paste doesn't conduct electricity i stated to spread whole CPU to increase surface which is radiate heat. On the memory chips i cut thermal pad and then put everything together.
Its been year since i fix it and console works cool and quiet.