Pro: The game recieves multiple years of continued bug support & content releases

Con: $500 for EU4

I’m not exactly sure what might be causing your problem, but I’m assuming you’ve tried purging & redownloading KDE Connect?

Another one would be trying to kill whatever process it thinks it running KDE Connect. You could either find it the normal way, or this link might help if you can’t easily find the process you need to kill.