Hi, I have an nVidia GT540M on my laptop, and when I first got it my games used to run perfectly. Then after about a year or so, every game I had started lagging. I couldn't even run Minecraft on max graphics smoothly. Not only that, but before, my laptop wouldn't get very hot while I was just browsing the web. But now it starts heating up when I'm on the desktop. And also, my laptop is really loud nowadays. What is the problem?