pve kernel: Out of memory: Killed process

It's been few days I face an issue, a VM crash suddenly and I could not find any reason from within the VM. Then I check systemctl in pve and I could find following logs but I don't understand how it can run out of memory. pve is on a 16 GB RAM and there is only one CT set with 2Gb and this VM set (at first) with 12 GB + ballooning. It was working well until recently. When I first found this issue, I then set the VM to 12 GB (with 8 GB minimum, not 12 GB like before).
Is 12 GB to high? Why...

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