New Bug In Windows 10 Anniversary Update Brings Wi-Fi Disconnects

Some Windows 10 PCs are now experiencing sudden drops in their Wi-Fi connections, with the Network Diagnostics tool reporting "Wi-Fi doesn't have a valid IP configuration." An anonymous reader quotes InfoWorld's Woody Leonhard:
I've heard from many people who blame the Wi-Fi disconnect on Friday's KB 3201845, the patch (which still isn't documented on the Win10 update history site) that brings version 1607 up to build 14393.479. It's unlikely that the new patch brought on the bug because the large influx of complaints started on December 7 -- two days before the patch...
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 December 6, 7 or 8.

Microsoft acknowledged the problem Thursday, recommending customers try restarting their PCs (or performing a clean start).
Woody writes that it looks like Microsoft's latest Windows 10 patch "didn't cause the bug. But the patch didn't fix it, either."