Need help finding the cause of my system crashing

Hello, i think its my first time posting, Please forgive me if i post in the wrong place or so…

But i have some of the weirdest errors right now.

First, heres my setup:

OS: Kubuntu 26.04 LTS (Resolute Raccoon) x86_64
Kernel: Linux 7.0.0-14-generic
Uptime: 21 mins
Packages: 3057 (dpkg), 25 (flatpak), 12 (snap)
Shell: fish 4.6.0
Display (VG248): 1920x1080 in 24", 60 Hz [External]
DE: KDE Plasma 6.6.4
WM: KWin (Wayland)
WM Theme: Sweet-ambar-blue
Theme: Breeze (Sweet-Ambar-Blue) [Qt], Breeze-Dark [GTK2], Breeze [GTK3]
Icons: candy-icons [Qt], candy-icons [GTK2/3/4]
Font: Noto Sans (10pt) [Qt], Noto Sans (10pt) [GTK2/3/4]
Cursor: Sweet (30px)
Terminal: kitty 0.46.1
Terminal Font: DejaVuSansMono (11pt)
CPU: Intel(R) Core(TM) i7-7700K (8) @ 5.00 GHz
GPU: NVIDIA GeForce RTX 2060 Rev. A [Discrete]
Memory: 7.01 GiB / 31.28 GiB (22%)

For some reason, it has happened a few times, when i use FFMPEG to encode a video (both on gpu and on cpu), and starting a game on steam (loading gpu stuff).

NVIDIA-SMI 580.159.03             Driver Version: 580.159.03     CUDA Version: 13.0 

And the PC just, crashes! Black screen, no feedback on nothing.. I can work without any problem ( i worked from home from about 8 am til 12 am-ish)… no problem what so ever. Then i just wanted to use ffmpeg to cut a videosnippet, and it crashed.

I have previously scoured the Nvidia forums, and used chatgpt to search the web, but no one seem to experience the same issue as me?

Do anyone here, have any clue?