This behaviour might be linked to errors (e.g. my qubes install does not
support 5.x xen kernels: crashes can be caused by "memory stress" and
even if not, they always finish by loads of qmemman log entries, before
deep freeze (not even a kernel panic, just sudden death)
What does "your qubes install" mean? Mine has been auto-updated to
kernel 5.4.88-1

mine too. But since this kernel crashes after 2-30 minutes I downgraded
(xen!) kernel back to 4.19.163. That works, at least. My App-VM's run
smoothly on 5.x kernels, even kernel-latest does fine.

I current think about limiting all small VMs to 256MB and dom0 to 2 GB
of RAM (by GRUB parameter) lacking any idea for a better approch.

Tell us if that works! My qubes has no grub. But you can set kernel
params in /boot/efi/EFI/qubes/xen.cfg

Again: What is special about "my qubes" ?
that is a poor try on non-violent communication. I have no grub
installed: qubes (4.0) came out of the box like that (using UEFI, as did
qubes 3.x before). I am surprised that qubes uses grub in other settings
:))

I modified /boot/grub2/grub.cfg (changing all dom0_mem=max:4096M values)
and this works as expected. After a few hours I could not figure out
limitations having the limits in place.
 very good news, thank you. Bernhard

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