Ubuntu 20.04.04 machine freezes

Hi, I have proxmox on a few few rented dedicated boxes, and for the first time this morning one of the vms on one of these servers decided to freeze. Full lockup, not responding anymore. According to the PVE gui the cpu continued at around 25% steady, but no network i/o, and no response on the console. Only way was to reset the vm, and it start up normally again.

Incidents happen. Hoewer, an hour later or so, it hang again. Reset it. 5 minutes later, it hang again. Then I rebooted the...

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