Host ERROR state and VM's UNKNOWN

My hosts and running run successfully, but after a period of time the host goes into ERROR state and all VM’s in UNKNOWN state, then i have to run command ‘sudo systemctl restart libvirtd’ and then DISABLE and ENABLE the host.

Can anyone tell y does it happens and do we have a permanent solution ?

I’m running version 5.4

You should try applying this configuration on the KVM nodes and restart libvirtd:

Edit: updated the link.

Best Regards
Anton Todorov