Hangs up every few days

Hello there,
I have some issues with a Home Assistant installation on an Intel Nuc running on Proxmox.
I’ve used the offical KVM Qcow2 Image to install it.
I’m using the Sonoff USB zigbee dongle via usb passtrough.
The issue is, that it completly hangs up every few days.
Can’t ping it it’s completly stuck.
I don’t think it has anything to do with proxmox though, because I have another installation on proxmox but without zigbee which is completly stable.
The logs don’t show anything about it.
Here a screenshot how it looks when it’s stuck:

Any ideas what i could try or what could be the cause of that?