[danpat]

Depends on which bit fails, but increases in packet loss are a common early symptom of small components no longer acting within their specs.

Network cards are subject to lots of signal phenomena that are rare inside the chassis. Long cables are pretty good antennas for certain types of RF signals, so there are all kinds of electrical noises, induced power spikes and other miscellaneous garbage that the network card has to tolerate. Well-shielded cables can help protect the card, but it's definitely one interface that's subject to a bit more electrical abuse than the rest.

Components that have been stressed beyond their tolerances a few times can result in things like signal filters having a lower noise threshold, which makes it harder for the card to pick out the signal from the noise, which leads to more packet loss. After enough abuse, the threshold drops below the usable level and communications halt.

There are lots of factors involved, such as shielding, proximity to nearby radiators, bend radius in cables, cable length, temperature, etc, etc. Whenever I delve into this world, I'm often amazed that anything works at all.