Here's one you should definitely be aware of.
A late-breaking Microsoft KB article details something I've seen others complain about experiencing. After upgrading from Windows 8.1 to Windows 10, some are finding that all discovered wireless networks go missing.
Microsoft has now provided a workaround involves deleting a registry key and running the network configuration utility, netcfg. If you're technically savvy, you can check it out here:
The problem results from having VPN software that is not quite Windows 10 compatible when the upgrade is performed. As of now, Microsoft has heard reports about the Cisco VPN client and the SonicWall Global VPN client specifically. Updated versions should already be available.
I've had something similar happen, but not in the exact way. My issue is where I have my Surface Pro 3 docked, connected to the network by cable, and all of a sudden the Surface Pro 3 switches to Wi-Fi and won't use the cable connection again until I reboot. This has happened a few times already today. Experienced this one? Let me know.