Reading the nice bit in red above every post...

Note: If you're asking for technical help, please be sure to include all your system info

Without knowing some specifics, it's impossible to answer your question. It's like taking your car in and only telling the mechanics it's making a funny noise, expecting them to instantly diagnose the problem. It could be a belt issue, could be a lack of lubrication issue, could be some misc debris caught up in something, etc.