Many Windows 10 users are suffering from a bug which causes wi-fi connections to disconnect.
Recently, some users have noticed (probably abruptly) that their Wi-Fi dropped out, with Windows complaining about an invalid IP configuration. Microsoft released a patch just the other day (who enjoyed a good ol' fashioned forced reboot from it?) that could have fixed the issue, but didn't.
Speculation at this point says the disconnect results when a machine performs a fast startup, setting the machine's IP address to 169.x.x.x. It's an old problem, but somehow it's come back in spades in the past two days. I have no idea what triggered the sudden outbreak, as there were no Win10 1607 patches issued on Dec. 6, 7 or 8.
This scoop was sent from my ArchLinux laptop connected through wifi. It's hard not to be a little smug about it. ;-)
(Score: 5, Informative) by LoRdTAW on Monday December 12 2016, @01:06PM
My friend called me about his father in laws laptop just yesterday. Both the WiFi and Ethernet would not connect and the troubleshooting utility displayed an invalid IP configuration for both adapters. I did a quick search and found an answer: reset the TCP/IP config.
Open a command prompt with admin privileges and run the following:
netsh winsock reset (ignore request to reboot)
netsh int ip reset
Reboot.
Afterwards, both the Ethernet and WiFi worked.