It sounds like it's overheating.Open up your computer and clean all the dust out, especially from the GPU and CPU.
1. Maybe your firewall is corrupting it.
... Thats A Sign Of A Virus!
Please don't offer solutions if you have no idea what you're talking about.
I suggest what dkamm and General richard Nick said.Btw General, I'm kidding.
Shutup.
"I wrote 'what' cause I like to stuffpost, then cover it up by agreeing with the people who tried to help!"