Something very similar just started happening to me, except my computer is not new and I haven't made any recent changes to either hardware or software. It seems like a hardware issue, and at first I thought it was a problem with my graphics card. But the other day it happened while I was listening to music, and I don't know how else to describe it other than to say that the exact same thing happened to the audio that happened to the graphics: slow deterioration until the point of everything stopping. It's really bizarre and I don't even know how to go about trouble shooting. I've done virus scans, malware scans, registry scans, but nothing. This thread is the only thing I've come across that sounds anything like what I'm experiencing.