Hi there, welcome to the forum.
This might be a recently closed kernel regression:
Due to
wifi: iwlwifi: disable 160 MHz based on subsystem device ID The driver should not send 160 MHz BW support for 5 GHz band in HE if PCI subsystem device ID indicates no 160 MHz support.
In my opinion you should try, using tethering with a mobile phone, to:
- fully update your system (so including kernel and firmware) and install the LTS and mainline kernels
garuda-update linux-lts linux-lts-headers linux-mainline linux-mainline-headers
- test all the kernels selecting them each time in the GRUB