Question Serious fps drops on my new laptop

Mar 3, 2019
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Hello guys, first of all i'm new on the forum and my English is not very well. Recieved a MSI GP 63 Leopard 8RE as a gift from Sweden in December. Everything was fine untill I started to play big games such as PUBG, GTA 5, BF1 etc. While playing old games such as CS GO or LOL there is not problem with fps. But after playing the first ones about 30minutes, fps suddenly drops and in every 10 seconds, it happens. Also while driving a car in this games it also happens. I realized that my CPU usage before drop is 100% and GPU is %60-70. When a drop happens they become %50 (cpu), %30-35(gpu) Tried everything but still can't fix it and it is very sad. Apologise for bad languge.

System Specs;
GTX 1060 6GB
Intel UHD 4000
I5 8300H 2.30GHz with turbo 4GHz - 4 cores 6MB cache
120Hz monitor
8GB DDR4 Ram
128 GB SSD
1TB HDD (the game is set up on HDD)

Thanks in advance