Get some cooling!
Too hot = sillicon death.
I'd be supprised if the integrated LAN overheated (unless it's gigabit), but other parts may well have done. Does anything else behave oddly or become unstable?
I'd get some extra cooling if I were you - fans, heatsinks, whatever. So long as it keeps your machine cooler.
Try checking the output of dmesg and see what it says about the network adapter.
Hope this helps!
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