Could be due to the graphics card over-heating. What graphics card are you using - laptop/desktop & make/model - & what's its temp before & during gaming?
You can check with HWMonitor & GPU-Z. G
Surface Pro (2017) vs Surface Pro 4
20 groundbreaking 3D animation techniques
How to mine Bitcoin on Mac
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.