I have Dell Optiplex 960 with Vista Business 64-bit.
Everyday after work I'm clicking "shut down" button which puts my machine into hybrid-sleep mode. It works great, but once a week just before saving whole memory to the disk, the computer restarts and I see a screen with options how to run my windows because of it.
I have similiar machine at home - DIY with Gigabyte motherboard, Vista Home Premium 64-bit - and had never saw such behaviour.
I found somwhere on the internet that disabling "Allow this device to wake up computer" checkbox for keyboard and mouse may help, but not in my case :-(
There is almost no information about those crashes in Event Viewer. For example yesterday I can find in System Log error at 18:03 that last shutdown from 18:01 was unexpected, but I have a hole in logs beetwen 14:58 and 18:02.
Should I search for some newer drivers or bios updates ?
EDIT: I've updated BIOS from version A01 to A03. Next day it happend again :-( Anyone know how to track drivers responsible for such behaviour?