The first thing i would look at is the event log, to see if it specifies anything.
Then i would test anotehr OS.
Then it would be time to look at eitehr specific driver and or hardware: memory and PSU.
I've already tested xp and ubuntu ..
xp has a problem in s3 mode standby
I dont know how to stand by in ubuntu
I read in another post that the device in the series cause the system to crash so i tried
this was caused by my usb router
it didnt support s3 power saving and my system used to cransh