One of the problem after upgrading to Windows 10 is WiFi not working or not Stable.
Solution Below:
1. Upgrade your WiFi Adapter. For Intel WiFi Adapters, you can install the following updated drivers provided by intel. Hope this will help you:
https://downloadcenter.intel.com/download/25833/Intel-PROSet-Wireless-Software-and-Drivers-for-Windows-10?v=t
2. If Upgrade is not working, Uninstall your WiFi Adapter Driver and Install Again.
3 .Reboot your Computer after doing step 1 or step 1 above.
