Hi Northwoodsman,
Actually the issue is even worse than it was before- I get the "failure" notification almost immediately and unfortunately, the issue has not resolved even though I am now using a new Win 10 PC from Dell. I migrated my Wx data to the new PC, installed the Davis software and the issue remained. I deleted the Module and all associated files in the Expansion folder, rebooted and installed the module again. Same result.
My station does not have any issues uploading real time, my data is there on the web. When I am away for an extended period I shut down my PC and load the data when I return, or, I used to...
Good luck if you hear from Davis. I haven't even bothered contacting Wunderground due to their web reputation for poor support...
John