Troubleshooting Wireless Connections
If your connection issue is related to wireless sync, note that there are various elements of this form of sync that do require a very specific set of circumstances.
To begin, you will need to connect your device via USB cable and open Settings > Phone > Wireless Sync to check if the feature is enabled. If you have recently changed the SSID of your wireless network, this will need to be updated here.
In addition, both phone and PC will need to be connected to the same domestic Wi-Fi network. Wireless sync is not supported across workplace Wi-Fi networks, according to Microsoft. Meanwhile, the phone battery needs to be at least half charged and be connected to a mains adapter rather than receiving charge through your computer.
Finally, the phone should be disabled, which basically means placing it on your desk with the screen off. If you are interacting with the device, the wireless sync will not occur!
Wireless syncing of your Windows Phone and your PC or laptop may also require an exception in the Windows firewall (or whatever firewall software you are using). This should happen automatically with most firewall utilities, but if it doesn’t you will have to apply a manual exception, steps for which you will find in the software documentation.