I have an XPS 15 that originally would run games perfectly but something recently happened where now the performance that happens in the game is a lot worse. I can't run CSGO above about 24 frames and if I go to full screen on a game like terraria I even start to lose major frames. When I check the task manager there seems to be nothing that is capping out and GPU usage is about 20% while CPU is around 50%. Memory is fine as well. What could be the issue because it use to run fine?