@voltronic have you tried adjusting the power management setting for your ethernet adapter (deselect the Allow the computer to turn off this device to save power checkbox thingy) and flushing your dns?
@Valkyrie_D @amarand
The fact that it's been doing this for both the Intel Pro dual gigabit card and also the onboard Realtek adapter is what's so odd.
Naturally, since posting this thread, I haven't had a disconnect...
@Valkyrie_D
Yes.