Shortcuts stop working, application windows aren't showing anymore and the systray seems to freeze

[Nikos Chantziaras]

After a while after logging in to KDE (maybe an hour, maybe two, maybe 
five, depends) all my global shortcuts stop working (including default 
ones, like Ctrl+F11 or PrintScr where "present windows" or Spectacle 
aren't shown, and custom ones, like WinKey+W for starting my web browser.)

Furthermore, the systray gets stuck and contains icons from application 
that are no longer running. Qutting Amarok for example will leave the 
systray icon behind. Which still shows the menus, btw, it isn't really 
frozen. But they do nothing, since the application the systray icon 
belongs to is not longer running.

Even worse, when starting applications that use a systray icon, their 
window isn't showing. There's no way to see those applications. They run 
in the background and are invisible.

Any tips? I'm on:

KDE Plasma 5.5.3
KDE Frameworks 5.18.0
KDE Applications 15.8.3 + 15.12.1

I have no idea where to report this bug. There's no "I don't know which 
part of KDE this belongs to" choice on the bug tracker.

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