Having an active wifi connection to, say a 'network1'. Playing around with ethernet-connections (and, e.g. setting ip adresses from automatic to manual and back because of tests with a new router) i experienced that the popup with the 'active connections' does lose the - still active - wifi entry. Going to a shell and checking with 'nmcli d wifi' i see that i am still connected to 'network1'. (which is, btw, still working properly!) I then could only disconnect using nmcli and reconnected with the network-popup in the systray. This is rather annoying as i would expect the systray network popup to reflect the active connections...? Reproducible: Didn't try
In case your problem is reproducible I would need information requested in the link below. Link: https://techbase.kde.org/Projects/Solid/Plasma-nm#My_connection_in_the_applet_shows_wrong_information
nota ny more in fedora25
Bulk transfer as requested in T17796