Since the upgrade to kernel 5.15.x, due to issue like these,
https://forum.proxmox.com/threads/kernel-bug-cpu-soft-lockup.110059/
https://forum.proxmox.com/threads/proxmox-7-watchdog-hard-lockup-cpu.111725/
I would like to try to install and boot the 5.13 kernel.
apt install pve-kernel-5.13...