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I have a problem with my gaming laptop that i recently bought from my best friend. It's a Lenovo Legion Y520. He just bought it and used it for about 4 months and play games like CSGO, DOTA2 and PUBG with no problem at all(little lag on PUBG). He's a guy that just comming to gaming world and plus hes English is very bad. So I requested him to factory reset the laptop before giving to me and that's all he did. And now I'm sitting here with some problem on the laptop and I don't really now how to fix it. First things I did on the laptop was downloading the drivers form Lenovo website and Intel drivers from their website. (used autoscan) and Nvidia Geforce Experience. Then I tried to play some games like CSGO, LoL, PUBG, WoW. Every game runs smoothly. But then the lag hits especially when I play CSGO or PUBG. Its lag when the shooting sound going to happen or when you riding a motorcycle and the sounds start to buzzing and every thing stutters. Its every annoying and confusing how a 4-5 months old gaming laptop going to lag like that. Is it the sound card too bad? Really on a new laptop model that just came out last year? Or do I missed something like driver? I was thinking to upgrade my RAM from 8 to 16. I have another Lenovo laptop that is 3-4 years old with a Nvidia 730M and it runs smoother then this. Help me please. *Spec* CPU: Intel Core i5-7300HQ GPU1:Nvidia Geforce GTX 1050 GPU2: Intel HD Graphics 630 RAM: 8GB