Login Failed

Am able to log into 3D Experience just fine. Launch Solidworks from the menu. Everything loads up just fine. Then I get a dialog box that says "Login Failed". What login? If I select "Cancel", then Solidworks closes. If I just close the dialog box, then sometimes I can continue to work. Other times, it won't let me open a file or continue. Not sure what to do with this or how to resolve it.