I read http://www.notebookcheck.net/NVIDIA-GeForce-920M.138763.0.html and see mostly RED marks on all games. This means that even at the lowest settings games stutter.

As to them starting out OK, well that's debateable to some but looking at the specs, it is expected to not game well.

Normally I would note laptop cooling pad use, canned air monthly cleanings but this machine is so low on the gaming totem pole that I think you are stuck.