You want the truth? It hasn't gone
It's just waiting........
Honestly, i can go weeks without having the problem. Then one night it will happen two or three times.
I have no idea what is triggering it, as i never do anything specific when it happens.
It just seems like a random occurrence to me. Honestly, it hasn't gone. But no, there is nothing to worry about. It has been happening on my PC ever since i got Vista about 7/8 months ago and it hasn't harmed my PC yet.
I don't class it as dangerous, just an inconvenience and very bloody annoying.
EDIT: It could have been bad luck. But what are the chances that thousands of people are having the same bad luck? This isn't connected to OC'ing btw, this has happened to me both OC'ed and at stock.
I am sure when a lot more people see this thread they will back me up.
Have you searched for the Vista update that fixes this issue? It may fix it for you, but if your Vista is up to date then you are in the same boat as me