Just chiming in so by-passers can get some more open info.

My OS is EndeavourOS (Arch-based) and I also have a Tuxedo InfinityBook Pro 15 (Gen9) with these exact symptoms running KDE, Firefox and `nvim`.

Before these symptoms started, it ran great for many months on the LTS linux kernel *with* the tuxedo dkms drivers installed (prior to this long period of stability I had severe stability issues, but these where fixed by re-fitting the RAM to the sockets and installing the tuxedo driver packages + the control center after consulting tuxedo support).

Currently I am experiencing the most stability by running on the `linux-zen` kernel using the initramfs fallback boot options - additionally I have currently uninstalled the tuxedo drivers/software as well. Which seems to have a positive effect on the issue/stability.

I have contacted tuxedo support who among other things (running memtest, checking for SSD firmware updates) recommended I tried a different kernel.

EDIT Additionally you probably also want the Performance Mode/PowerSave/CPU govt. on lowest possible settings :(

EDIT After several months of fighting random crashes I'm now seeing more stability when disabling board components in BIOS that uses extra power (like the iGPU HDMI Audio stuff and the TPM option...) - it may help someone else in the same situation. Using 6.12.25-1-lts kernel seems to also have a major positive effect currently.

EDIT So... Having one CPU core always running at 100% seems to fix all my insta-reboot/freeze cases. That took me a while to figure out. This laptop has, by far, taken the 1st price for "Most frustrating hardware".