The lan driver missing is probably a symptom, not the problem. Probably caused by data corruption from the random shut downs.
I'd still return and get a replacement. Can't really sell a dud laptop can you... Unless you like ripping people off...
No going to do a complete restore, and test it...I need to wait for the macbooks first, and what i will be selling it for anyone will buy it for that price even with the shutdowns disclosed...however I feel it might have something to do with magic network, it started on that day...so I will wait and restore,,,,no one is getting ripped off