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.

A think to note is that a lot of people can begin displaying symptoms of ADHD as an adult, once the structure of life as a child goes away. I wasn’t diagnosed until I was 23, and we never would have even considered I had it until I was 21. If you’re relating to a lot of ADHD stuff, it might be worth getting tested. Worst case scenario, you don’t have it but get pointed towards other supports for you struggles.