I used to have this problem with my P5N-E Sli where over time it would slowly die.
Like first the ethernet would die (would randomly disconnect, but after trying repair the process would freese after disabling the adapter, after trying to renable the adapter it would pause for a while and then tell me it failed to connect to the adapter.)
a restart would normally solve this problem, but shutting down normally just didnt work, it would log off (it would take its time about it) but then just stop.
But after a couple of days the same thing would happen again.
then after this a hard drive would die, along with various other intermittent faults.
At this point i would have both the hard drive and the motherboard replaced. But this happened with 3 motherboards in the space of about 3 months so i bought a p5k premium
But its now happening with that so i assumed it had nothing to do with the motherboard, but the question is what IS the problem?