That only made it worse for me.
I can report 16 hours of uptime with
5.11.22-7-pve #1 SMP PVE 5.11.22-12 (Sun, 07 Nov 2021 21:46:36 +0100) x86_64 GNU/Linux
wihtout any issues - so far.
So maybe i need to find out how to either stick to that kernel for some while, while being headless, i.e...