First, a question. As far as I know, surge protectors protect devices in case of high voltage surges in AC Power line (e.g. Lightning strike on electric pole) by bypassing it to the Ground/Earth line. But what if the lightning strikes the building instead? Shouldn't the surge then come through the Earth line, being easily transferred from the building structure instead of coming through the Power line?
Now, the story. Yesterday, a lightning bolt struck our building's roof. The impact was so strong that part of the railing got destroyed. There was no electricity already when it happened, so the electrical damages didn't become apparent until a few hours later. Other flats in our building had heavy casualties, mostly LCD/LED TVs and cordless phones. But thankfully in my flat, the circuit breaker fell immediately when the lightning struck (I guess this proves that the surge indeed came through the power line), and all of the important gadgets were already protected by UPS and Voltage stabilizers. All but one single router. The result, the port on the switch of my ISP's utility box my connection came from got fried. And my motherboard's Ethernet adapter disappeared, even from the device manager. But the router in question is working perfectly fine.
And now, the other question. The Ethernet adapter reappeared in my device manager this morning. But it now works only in 10mbps link speed, sometimes at 100mbps, but never connects at 1Gbps like before. And occasionally, it disappears for a few minutes, halting all network traffic and then reappears. So, what would be the best action regarding this Ethernet adapter?
Also, some pictures of the impact location: