A sharp drop in FPS for a few seconds (i3 7100U, 940mx, 6 GB RAM) (Metal Gear Solid 5: The Phantom Pain)

Generally bought MGSV but a laptop with these characteristics:
7100U I3 2.4 GHz, 6 GB RAM, graphics card 940mx 2 GB GDDR5. Two months on the minimum salary played at 60fps. but today I start the game and notice that a stable 60 fps like before anymore, often dramatically drops the fps to 35-40, and again at 58, very uncomfortable to play. The CPU temperature is above 63 degrees does not rise, same thing with the video card the above was not 62. The thing is,like, not in the throttle. But in the program GPU-Z in the tab GPU Core Clock and GPU Memory Glock the graph shows how the frequency drops to about 400 MHz and again rises to maximum. Percent and video card are not loaded at 100%. What could be wrong? A new laptop, bought 2 months ago.