Troubleshooting Sync Connection Problems
When the PC is connected to the Internet or a local network, in some cases the PC may disconnect the connection with your device in favor of the Internet or network connection.
If this happens, tap Start > Settings > Connections tab > USB to PC, and then clear the Enable advanced network functionality check box. This makes your PC utilize a serial USB connection with your device.
The USB to PC ( ) icon appears on the Today Screen when a serial USB connection is used.
72 Section 5: Synchronizing Information With Your Computer