For the last couple of days I've been noticing whenever the  laptop is on load then the fan will start making noises, but it's very different than normal, it was quite loud and it sounds like when a fan is always hitting something or when a fan is very close to the ground and it cannot gets air. The thing is, today it got worse, the sound got louder and starts sometimes acting like if you're hearing a noise of a car, when the driver goes vroom vroom but multiple and consecutive times. I have tried opening up the back and saw nothing wrong with the fan, maybe I'm missing something?