We we’re able to isolate the restart and shutdown issue. In Arch (June 1st ISO), the splash screen message on Kernel 5.19.3 (restart only) was about network and mirrors list refresh. We are not using Ethernet, turn it OFF in the BIOS removes the bug.
All is good now.
pacman -Qii linux60
Name : linux60
Version : 6.0.0rc2-1
Description : The Linux60 kernel and modules
Architecture : x86_64
URL : https://www.kernel.org/
Licenses : GPL2
Groups : None
@pheiduck is referring to the recent Arch update of grub:
Upgrading grub (2:2.06.r322.gd9b4638c5-1 -> 2:2.06.r322.gd9b4638c5-3)...
:: To use the new features provided in this GRUB update, it is recommended
to install it to the MBR or UEFI. Due to potential configuration
incompatibilities, it is advised to run both, installation and generation
of configuration:
$ grub-install ...
$ grub-mkconfig -o /boot/grub/grub.cfg