The laptop slows down, I'm suffering with it for a week, help people are kind)

The situation is as follows, reinstalled Windows on the laptop for a couple of days, literally downloaded Fallout 4, decided to play, start to play and start jumping FPS in places everything is in order, but after five, maximum half a minute starts to slow down brakes in different ways somewhere 5 seconds somewhere more, everything was set to a minimum, absolutely everything was pushed onto minimal wages and the laptop is pretty weighty before this witcher 3 on high without problems dragged 60 fps it was stable after reinstallation it stops kapets thought the problem is that it uses a secondary vidyuhu those built-in from intel, but no, I changed it and still the laptop doesn't seem to overheat like that like when in the game I go to a very small location, everything flies and dances without problems, all the firewood is on the motherboard and on both Windows 10 x64 video cards here are the laptop systems (geforce gtx 960m, percent Intel Core i7-4720HQ CPU 2.60 Gh and 12 GB of RAM) tell me what might be wrong and how to fix it I will be grateful Asus G771JW laptop