Supposedly this is due to a bug in the GFX driver, that when it panics it will overwrite non-volatile memory of the network card (e1000e) which then kills the network card. It may also be over-writing other non-volatile memory of other things, but the network card is where you notice it first.
The network card can be restored with a BIOS update, though you may have to reset the MAC address if it gets wiped out too.