My Win7 Cube desktop keeps closing itself down after what I guess is about a couple of hours in idle. The processor is Intel Core2 Quad Q9650 @ 3.00 GHz with 4GB of RAM, Windows 7 (32 bit) Home Premium SP1. I have automatic Windows updates set on, and Avira free a/v.
I guess this started happening about 6 months ago. It's not my main pc so I was none too bothered at the time, thinking it was a Windows glitch which would be sorted out in a subsequent update. But now it's getting on my nerves and I want to find out the cause.
This machine is rarely used for anything other than internet browsing. When in use, it's fine - no hint of trouble.