CachyOS shut down suddenly.

I've been using CachyOS for about two or three months. And until today, I hadn’t encountered a single bug or issue. While watching a video in full-screen mode on YouTube, my laptop suddenly shut down as if the power had gone out—even though the battery was fully charged and it was plugged in. At first, I thought the video had frozen or something; I didn’t even realize what was happening until I noticed the keyboard backlight is gone then. When I checked with "journalctl" to see if this was directly related to CachyOS or linux kernel, there were no logs regarding this incident.I also checked the system logs in the BIOS to see if there was a hardware error, but I still couldn’t find anything.

What could be causing this? Could be related wtih cachy or linux kernel?

DELL G15 5530 G155530010U
Intel Core i7-13650HX 3.60
NVIDIA GeForce RTX 4050 6GB Laptop GPU 140W (really 140W)
16GB DDR5 4800MHz RAM
512GB NVMe SSD
FHD 15.6" 1920x1080 IPS 165 Hz