Haven't resolved this yet, and am rearranging our home network physically so that both my wife and I can hardwire to the router. However, my laptop is sitting here with the 1511 upgrade downloaded...

Tried that, no joy. CenturyLink tech support checked out the router and all my settings. Everything seems to be in order. Thanks for the reply.

Thanks for the link to the Atheros driver site. I did get an updated driver, however, it didn't help my problem. Thanks for replying, though.

You are right. I disabled NetBIOS over TCP/IP and it didn't help. However, I have reinstalled the WiFi driver, and now the troubleshooter says 'The DNS server isn't responding. Your computer is...

Upon further investigation it seems this bug is related to NetBIOS over TCP/IP. If it's disabled, problem disappears. It seems it's enabled by deafault when using static IP.

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This seems to...