hitching and skipping frames problem on lenovo edge 15

recently i bought a lenovo edge 15 with 8gb of ram and a nvidia 840m.

Almost every game is hitching, i play skyrim and fallout 3 which are known to be problematic, but even dragon age origin which should be finehas this problem, basically the frame drops keeps stable then it drops and skips.

I don't how to stop it, no matter the setting this keeps happening

please help.