Question I have problem with my Nvidia GPU and Intel CPU

Sep 22, 2019
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Hello dear friends,
I have Asus X556U with 940MX Nvidia graphic and Intel i7-7500 CPU.
When I launch a game or start rendering a video, task manager showed me that rendering was going on with Intel GPU. I searched on YouTube and find out that I should change some settings in Nvidia control panel and suggested to change 3D settings from "auto-select" to "High performance" . I set that and it was ok just for few seconds (About 50 seconds) and then rendering went on with Intel GPU (for about 10 seconds,with lagging and high-speed fan) this process repeats again and again.
I really confused how it happens... Please help me if you know the solution.