Black screen short time after login / multiple wayland instances

Hello,

I currently have a problem with my fresh Fedora 40 KDE installation. I only installed nvidia 555.58.02 driver and the updates.

When I’m logging in to my user account I have ~1 minute time to work like normal, after that the screen goes black.

I then can switch between the instances with STRG + ALT + F(1-4). In my current instance, when i switch to f.e. F1, i have the login screen from fedora, on F2 i have my instance which I logged into after boot and where I am still logged in, on F3 i only have the terminal where i can login as my user too. (The order is not always the same, sometimes F1 is the terminal, F2 the login screen and F3 the instance where I’m already logged in)

Does anyone know why my fresh install is spawning a second wayland process and how i can get rid of it? One is running under my user and the other one with SDDM (not sure if it’s the right name, I’m not in front of my computer right now, it is the desktop manager what I’ve read)

Output from neofetch, if this somehow helps:

OS: Fedora Linux 40 (KDE Plasma) x86_64

Kernel: 6.9.11-200.fc40.x86_64

Uptime: 8 mins

Packages: 2315 (rpm)

Shell: bash 5.2.26

Resolution: 2560x1440

DE: Plasma 6.1.3

WM: kwin

Theme: Breeze-Dark [GTK2], Breeze [GTK3]

Icons: breeze-dark [GTK2/3]

Thanks in advance