I'm having the same issue with my 8300/ onboard broadcom. It works fine and then just stops while it's powered up. Probably sometime during sleep mode. I thought it was due to an automatic update from windows, acrobat, macfee..or something. After finding this thread it appears I can stop chasing my tail. So, I didn't read every post in these 19 pages, but it appears the only solution is but a network card, or unplug it, restart until it appears. After 15 months...it's sad to see that's our only option. Probably my last Dell after 15 years of using them in my construction company.
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