Sometimes ctrl + w (close tabs) and windows super key (open lancher) doesnt work.
To make it work, I need to open Keyboard Hardware and Layout, test something in "test area", and then wait a few seconds.
Do I need to reinstall something?

Distro: Debian 9
KDE Plasma Version: 5.8.6
KDE Frameworks Version: 5.28
Qt Version: 5.7.1
Kernel Version: 4.9.0-8-amd64
Os Type: 64-bit