I have discovered another issue id like to share with you regarding the PRTG Desktop software.
Windows 10 Enterprise 1803
When the desktop app is open and minimized to the system tray - when my machine locks itself and/or wakes up from sleep - the desktop app will not reconnect to the server automatically. Even clicking the refresh button doesnt wake it back up. Just sits there saying "Could not connect"
Have to close the app down and reopen it to establish a connection again.
Becasue the system tray icon is there though its hard to know if its working or not, a few instances i was expecting warnings and down notifications from it - but it never because it hadnt reconnected itself.