Just to be clear: Are you able to see your server name/IP consistently using an ethernet cable from the viewer until now or did the viewer eventually lose the ability to detect the server after some time?
For further analysis, please send us the diagnostic info of your primary machine.
Just open the spacedesk Driver Console app -> Diagnostics -> click the “Save All Information” button.
PS: Saving all information will take a few seconds, then please send us the whole folder which contains all the diagnostic logs collected.
Please right-click the folder -> Send to -> Compressed (zipped) folder, then attach the *.zip file in your next reply.