I have the same problem with random crashes, sometimes involving the screensaver even though I have it set to never it still comes on!, I however am not willing to turn off my onboard lan as I need them for both OS I use hopefully there will be some new nvid. network drivers in the new revision that will fix this problem, Im also hopping we see a new kernal that allows sleep in some form or another as sleep is not supported in this revision.

I will also try your method as It seems to crash after 8 hours or so and its always after the screensaver.

Good Luck