Hi,
What about restart explorer.exe in Task manager when this issue happened?
Please check the event log, the system part, and see if there is any error related to explorer.exe.
Additional things you can try are that please reinstall the network adapter and run system file checker tool to see if there is any corrupted system files:
SFC /SCANNOW
Since this issue just happened on the surface device, I suggest you submit a new case on Surface forum as they will be more professional on your issue:
Contact Microsoft Support for Surface
http://www.microsoft.com/surface/en-sg/support/contact-us/
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