Just wanted to add one thing. I did encounter a similar problem a long time ago (maybe a year or more ago) but not as lengthy in duration. It was the same issue with no wired connection, and reprogramming, resetting on their end etc. didn't work. I can't remember how it got fixed, but eventually it did. So, this is another reason why I don't think the network card is the issue because at that time, there was no issue of power outage or anything. Sorry, just wanted to add that in.
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