Dear friends,
Lately been getting this issue, upon which every time i logon and load a browser or webapp the desktop starts to flicker and goes black on all connected displays. I then reboot & it might or might not return again until i turn on the device again.
Is there a way to restart the desktop please like alt + F2 in some debian based, the cmd below doesn’t seem to do much or a fix please 
?:
God bless 
Hey! I used to use
kquitapp5 plasmashell && kstart5 plasmashell
I think that’s defunct now. Have a look at
plasmashell --help
Thank you
In addition to @Canoe’s suggestion, here’s another alternative.
systemctl --user restart plasma-plasmashell.service
Thanks, i find these cmd below work better, systemctl –user restart plasma-plasmashell.service, doesn’t seem to do anything 
on my ver.
5.xx above ver of KDE:
kquitapp5 plasmashell #stops but optional
killall plasmashell # stops
kstart plasmashell #restarts
startplasma-wayland #restarts
startplasma-x11
Cheers
If you are using X.org and not wayland then you can try to use the key combination CTRL+ALT+Backspace. It may not work for every setup.
Just a heads-up that this isn’t enabled by default anymore for EOS, more so given Wayland is becoming default for most distros now.
I did not know that. Thanks.