Notebook Hardware and Upgrade Questions

Hello everybody, and thanks for reading this!

Please accept my appology if my writtings aint fine enough!

I got a hp am 101 ne laptop about one year past and it is working fine until now. A few days ago I've got a tricky prob with it:

When I play Dota 2, which I love it very much since warcraft III, and the laptop is on battery, every thing goes fine and I got a relatively good fps on lowerd graphic options. But, when I plug it to wall, with the same settings and same fps result, its temreture rises just as the fan does and suddenly laptop shuts it self down (hibernate) to prevent itself from damage, I assume.

No lag nor error happens but the machine turns of with out no sign. I tried to check cpu and gpu usage while this happens and they were something around 45% and 64% both, even at shuttingdown moment!

I've found out that if I disable the dedicated graphic card (AMD R5 M430), and use Intel HD Graphics 620 even while plugged in the problem wont come out. But, disabling AMD R5 makes the laptop fan to always work on medium speed and as soon as I re enable it fan(s) slow down, which I don't know why.

I tried to update my drivers to last version and use opengl vulkan dx9 dx11, but non make any difference except for vulkan which caused the game to auto close right after launching while AMD enabled, and game misfunctioning on Intel HD.

This problem only appears in Dota2 but something like this happened in Sim3 and Assassin's Creed Renaissance in which the laptop overheats and fan(s) speed up but no shutdown accurs.

I was thinking of buying a cool pad, like Deep Cool N17, or opening my notebook and clearing air vents and other staff there - which I don't know even their names, but finally decided to come here and ask professionals first.

Sorry againg for my poor english and thak you very much for come along with it so far!