I was using my MBP, and it was slow to load a page with a lot of media content on it. So the little rainbow loading circle came up, and it loaded the page, but when it did, it started making loud fan noises. I immediately closed the lid and let it sleep, and noticed the bottom was very hot - I was sitting on my bed and it tends to get hot when not on a flat surface seemingly. I gave it a moment and then opened it back up, and the noises are seemingly gone, and all seems well. Anyway, is this normal? Anything wrong with my MBP?