Question Windows heavy lagging

Nov 15, 2018
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Hello,
For a long time now I´ve had problem with Windows lagging - dropping to like 1 frame per 3 seconds. This usually lasts for a minute and then PC returns back to normal. I have got this problem like 1 month after the PC was build, last half a year there was no problem but lately it came back and seems more frequent. Usually, it happens during gaming, but it often comes back even after I close the game and the system is under no load. Temps during gaming are around 70°C on GPU and 70-75°C on CPU, while CPU never shows full usage and disc usage doesn´t spike either.

GeForce RTX 2080
Intel Core i7-8700K
16GB RAM @3000MHz
SSD Samsung EVO 850 (Win,games), HDD